diff --git a/basis/bootstrap/image/image.factor b/basis/bootstrap/image/image.factor
index 5bf3c30097..dde945e9af 100644
--- a/basis/bootstrap/image/image.factor
+++ b/basis/bootstrap/image/image.factor
@@ -111,7 +111,7 @@ SYMBOL: jit-define-offset
         jit-define-rc get
         jit-define-rt get
         jit-define-offset get 3array
-    ] { } make prefix ;
+    ] B{ } make prefix ;
 
 : jit-define ( quot name -- )
     [ make-jit ] dip set ;
@@ -135,7 +135,6 @@ SYMBOL: bootstrap-global
 SYMBOL: bootstrap-boot-quot
 
 ! JIT parameters
-SYMBOL: jit-code-format
 SYMBOL: jit-prolog
 SYMBOL: jit-primitive-word
 SYMBOL: jit-primitive
@@ -185,7 +184,6 @@ SYMBOL: undefined-quot
     H{
         { bootstrap-boot-quot 20 }
         { bootstrap-global 21 }
-        { jit-code-format 22 }
         { jit-prolog 23 }
         { jit-primitive-word 24 }
         { jit-primitive 25 }
@@ -538,7 +536,6 @@ M: quotation '
     \ mega-cache-miss \ mega-miss-word set
     [ undefined ] undefined-quot set
     {
-        jit-code-format
         jit-prolog
         jit-primitive-word
         jit-primitive
diff --git a/basis/compiler/codegen/fixup/fixup.factor b/basis/compiler/codegen/fixup/fixup.factor
index 45d87b3270..99f258d93c 100755
--- a/basis/compiler/codegen/fixup/fixup.factor
+++ b/basis/compiler/codegen/fixup/fixup.factor
@@ -9,9 +9,7 @@ IN: compiler.codegen.fixup
 
 GENERIC: fixup* ( obj -- )
 
-: code-format ( -- n ) 22 getenv ;
-
-: compiled-offset ( -- n ) building get length code-format * ;
+: compiled-offset ( -- n ) building get length ;
 
 SYMBOL: relocation-table
 SYMBOL: label-table
@@ -91,4 +89,4 @@ SYMBOL: literal-table
         literal-table get >array
         relocation-table get >byte-array
         label-table get resolve-labels
-    ] { } make 4array ;
+    ] B{ } make 4array ;
diff --git a/basis/cpu/x86/bootstrap.factor b/basis/cpu/x86/bootstrap.factor
index 4f9a94a58b..f89839aa83 100644
--- a/basis/cpu/x86/bootstrap.factor
+++ b/basis/cpu/x86/bootstrap.factor
@@ -8,8 +8,6 @@ IN: bootstrap.x86
 
 big-endian off
 
-1 jit-code-format set
-
 [
     ! Load word
     temp0 0 MOV rc-absolute-cell rt-immediate jit-rel
diff --git a/vm/code_block.c b/vm/code_block.c
index 4331291083..1d428e4fcd 100644
--- a/vm/code_block.c
+++ b/vm/code_block.c
@@ -396,7 +396,7 @@ void relocate_code_block(F_CODE_BLOCK *compiled)
 }
 
 /* Fixup labels. This is done at compile time, not image load time */
-void fixup_labels(F_ARRAY *labels, CELL code_format, F_CODE_BLOCK *compiled)
+void fixup_labels(F_ARRAY *labels, F_CODE_BLOCK *compiled)
 {
 	CELL i;
 	CELL size = array_capacity(labels);
@@ -413,31 +413,6 @@ void fixup_labels(F_ARRAY *labels, CELL code_format, F_CODE_BLOCK *compiled)
 	}
 }
 
-/* Write a sequence of integers to memory, with 'format' bytes per integer */
-void deposit_integers(CELL here, F_ARRAY *array, CELL format)
-{
-	CELL count = array_capacity(array);
-	CELL i;
-
-	for(i = 0; i < count; i++)
-	{
-		F_FIXNUM value = to_fixnum(array_nth(array,i));
-		if(format == 1)
-			bput(here + i,value);
-		else if(format == sizeof(unsigned int))
-			*(unsigned int *)(here + format * i) = value;
-		else if(format == sizeof(CELL))
-			*(CELL *)(here + format * i) = value;
-		else
-			critical_error("Bad format in deposit_integers()",format);
-	}
-}
-
-CELL compiled_code_format(void)
-{
-	return untag_fixnum_fast(userenv[JIT_CODE_FORMAT]);
-}
-
 /* Might GC */
 F_CODE_BLOCK *allot_code_block(CELL size)
 {
@@ -469,7 +444,7 @@ F_CODE_BLOCK *allot_code_block(CELL size)
 /* Might GC */
 F_CODE_BLOCK *add_code_block(
 	CELL type,
-	F_ARRAY *code,
+	F_BYTE_ARRAY *code,
 	F_ARRAY *labels,
 	CELL relocation,
 	CELL literals)
@@ -477,11 +452,10 @@ F_CODE_BLOCK *add_code_block(
 #ifdef FACTOR_DEBUG
 	type_check(ARRAY_TYPE,literals);
 	type_check(BYTE_ARRAY_TYPE,relocation);
-	assert(untag_header(code->header) == ARRAY_TYPE);
+	assert(untag_header(code->header) == BYTE_ARRAY_TYPE);
 #endif
 
-	CELL code_format = compiled_code_format();
-	CELL code_length = align8(array_capacity(code) * code_format);
+	CELL code_length = align8(array_capacity(code));
 
 	REGISTER_ROOT(literals);
 	REGISTER_ROOT(relocation);
@@ -506,16 +480,11 @@ F_CODE_BLOCK *add_code_block(
 	compiled->literals = literals;
 	compiled->relocation = relocation;
 
-#ifdef FACTOR_DEBUG
-	type_check(ARRAY_TYPE,compiled->literals);
-	type_check(BYTE_ARRAY_TYPE,compiled->relocation);
-#endif
-
 	/* code */
-	deposit_integers((CELL)(compiled + 1),code,code_format);
+	memcpy(compiled + 1,code + 1,code_length);
 
 	/* fixup labels */
-	if(labels) fixup_labels(labels,code_format,compiled);
+	if(labels) fixup_labels(labels,compiled);
 
 	/* next time we do a minor GC, we have to scan the code heap for
 	literals */
diff --git a/vm/code_block.h b/vm/code_block.h
index b8201c44a1..385f414f88 100644
--- a/vm/code_block.h
+++ b/vm/code_block.h
@@ -79,8 +79,6 @@ void mark_object_code_block(CELL scan);
 
 void relocate_code_block(F_CODE_BLOCK *relocating);
 
-CELL compiled_code_format(void);
-
 INLINE bool stack_traces_p(void)
 {
 	return userenv[STACK_TRACES_ENV] != F;
@@ -88,7 +86,7 @@ INLINE bool stack_traces_p(void)
 
 F_CODE_BLOCK *add_code_block(
 	CELL type,
-	F_ARRAY *code,
+	F_BYTE_ARRAY *code,
 	F_ARRAY *labels,
 	CELL relocation,
 	CELL literals);
diff --git a/vm/code_heap.c b/vm/code_heap.c
index 0ae3d6b3fa..6ba98dfa77 100755
--- a/vm/code_heap.c
+++ b/vm/code_heap.c
@@ -93,7 +93,7 @@ void primitive_modify_code_heap(void)
 			CELL literals = array_nth(compiled_code,0);
 			CELL relocation = array_nth(compiled_code,1);
 			F_ARRAY *labels = untag_array(array_nth(compiled_code,2));
-			F_ARRAY *code = untag_array(array_nth(compiled_code,3));
+			F_BYTE_ARRAY *code = untag_byte_array(array_nth(compiled_code,3));
 
 			REGISTER_UNTAGGED(alist);
 			REGISTER_UNTAGGED(word);
diff --git a/vm/jit.c b/vm/jit.c
index 8421b79468..8145d18b36 100644
--- a/vm/jit.c
+++ b/vm/jit.c
@@ -13,9 +13,8 @@ void jit_init(F_JIT *jit, CELL jit_type, CELL owner)
 	REGISTER_ROOT(jit->owner);
 
 	jit->type = jit_type;
-	jit->code_format = compiled_code_format();
 
-	jit->code = make_growable_array();
+	jit->code = make_growable_byte_array();
 	REGISTER_ROOT(jit->code.array);
 	jit->relocation = make_growable_byte_array();
 	REGISTER_ROOT(jit->relocation.array);
@@ -29,7 +28,7 @@ void jit_init(F_JIT *jit, CELL jit_type, CELL owner)
 /* Allocates memory */
 F_CODE_BLOCK *jit_make_code_block(F_JIT *jit)
 {
-	growable_array_trim(&jit->code);
+	growable_byte_array_trim(&jit->code);
 	growable_byte_array_trim(&jit->relocation);
 	growable_array_trim(&jit->literals);
 
@@ -66,9 +65,9 @@ static F_REL rel_to_emit(F_JIT *jit, CELL template, bool *rel_p)
 	else
 	{
 		*rel_p = true;
-		return (to_fixnum(rel_type) << 28)
-			| (to_fixnum(rel_class) << 24)
-			| ((jit->code.count + to_fixnum(offset)) * jit->code_format);
+		return (untag_fixnum_fast(rel_type) << 28)
+			| (untag_fixnum_fast(rel_class) << 24)
+			| ((jit->code.count + untag_fixnum_fast(offset)));
 	}
 }
 
@@ -79,7 +78,8 @@ void jit_emit(F_JIT *jit, CELL template)
 	bool rel_p;
 	F_REL rel = rel_to_emit(jit,template,&rel_p);
 	if(rel_p) growable_byte_array_append(&jit->relocation,&rel,sizeof(F_REL));
-	growable_array_append(&jit->code,code_to_emit(template));
+	F_BYTE_ARRAY *code = code_to_emit(template);
+	growable_byte_array_append(&jit->code,code + 1,array_capacity(code));
 	UNREGISTER_ROOT(template);
 }
 
diff --git a/vm/jit.h b/vm/jit.h
index 0e27f2a7ab..2085c8c8bd 100644
--- a/vm/jit.h
+++ b/vm/jit.h
@@ -1,8 +1,7 @@
 typedef struct {
 	CELL type;
 	CELL owner;
-	CELL code_format;
-	F_GROWABLE_ARRAY code;
+	F_GROWABLE_BYTE_ARRAY code;
 	F_GROWABLE_BYTE_ARRAY relocation;
 	F_GROWABLE_ARRAY literals;
 } F_JIT;
@@ -11,7 +10,7 @@ void jit_init(F_JIT *jit, CELL jit_type, CELL owner);
 F_CODE_BLOCK *jit_make_code_block(F_JIT *jit);
 void jit_dispose(F_JIT *jit);
 
-INLINE F_ARRAY *code_to_emit(CELL template)
+INLINE F_BYTE_ARRAY *code_to_emit(CELL template)
 {
 	return untag_object(array_nth(untag_object(template),0));
 }
diff --git a/vm/quotations.c b/vm/quotations.c
index 0e24297ac1..d358a2c571 100755
--- a/vm/quotations.c
+++ b/vm/quotations.c
@@ -310,7 +310,7 @@ worse than the duplication itself (eg, putting all state in some global
 struct.) */
 #define COUNT(name,scan) \
 	{ \
-		CELL size = array_capacity(code_to_emit(name)) * code_format; \
+		CELL size = array_capacity(code_to_emit(name)); \
 		if(offset == 0) return scan - 1; \
 		if(offset < size) return scan + 1; \
 		offset -= size; \
@@ -324,8 +324,6 @@ struct.) */
 
 F_FIXNUM quot_code_offset_to_scan(CELL quot, F_FIXNUM offset)
 {
-	CELL code_format = compiled_code_format();
-
 	CELL array = untag_quotation(quot)->array;
 
 	bool stack_frame = jit_stack_frame_p(untag_object(array));
diff --git a/vm/run.h b/vm/run.h
index e3e7aacf6f..d32a91e67a 100755
--- a/vm/run.h
+++ b/vm/run.h
@@ -33,8 +33,7 @@ typedef enum {
 	GLOBAL_ENV,               /* global namespace */
 
 	/* Quotation compilation in quotations.c */
-	JIT_CODE_FORMAT     = 22,
-	JIT_PROLOG,
+	JIT_PROLOG          = 23,
 	JIT_PRIMITIVE_WORD,
 	JIT_PRIMITIVE,
 	JIT_WORD_JUMP,