diff --git a/basis/bootstrap/assembler/x86.factor b/basis/bootstrap/assembler/x86.factor
index 2ffcfaed2d..f5dd5884e6 100644
--- a/basis/bootstrap/assembler/x86.factor
+++ b/basis/bootstrap/assembler/x86.factor
@@ -136,22 +136,6 @@ big-endian off
     leaf-stack-frame-size bootstrap-cell - RET
 ] \ leaf-signal-handler define-sub-primitive
 
-[| |
-    jit-signal-handler-prolog
-    temp0 vm-reg vm-signal-handler-addr-offset [+] MOV
-    temp0 CALL
-    jit-signal-handler-epilog
-    red-zone-size RET
-] \ ffi-signal-handler define-sub-primitive
-
-[| |
-    jit-signal-handler-prolog
-    temp0 vm-reg vm-signal-handler-addr-offset [+] MOV
-    temp0 CALL
-    jit-signal-handler-epilog
-    red-zone-size 16 bootstrap-cell - + RET
-] \ ffi-leaf-signal-handler define-sub-primitive
-
 [
     ! load boolean
     temp0 ds-reg [] MOV
diff --git a/basis/bootstrap/image/image.factor b/basis/bootstrap/image/image.factor
index eeb3d3f9a1..7edc3c00ea 100755
--- a/basis/bootstrap/image/image.factor
+++ b/basis/bootstrap/image/image.factor
@@ -464,8 +464,6 @@ M: quotation prepare-object
         { SET-FPU-STATE-WORD set-fpu-state }
         { SIGNAL-HANDLER-WORD signal-handler }
         { LEAF-SIGNAL-HANDLER-WORD leaf-signal-handler }
-        { FFI-SIGNAL-HANDLER-WORD ffi-signal-handler }
-        { FFI-LEAF-SIGNAL-HANDLER-WORD ffi-leaf-signal-handler }
     }
     \ OBJ-UNDEFINED undefined-def 2array suffix [
         swap execute( -- x ) special-objects get set-at
diff --git a/basis/stack-checker/known-words/known-words.factor b/basis/stack-checker/known-words/known-words.factor
index 1f10943d78..ad762cc3af 100644
--- a/basis/stack-checker/known-words/known-words.factor
+++ b/basis/stack-checker/known-words/known-words.factor
@@ -368,8 +368,6 @@ M: object infer-call* \ call bad-macro-input ;
 \ enable-gc-events { } { } define-primitive
 \ eq? { object object } { object } define-primitive \ eq? make-foldable
 \ fclose { alien } { } define-primitive
-\ ffi-signal-handler { } { } define-primitive
-\ ffi-leaf-signal-handler { } { } define-primitive
 \ fflush { alien } { } define-primitive
 \ fgetc { alien } { object } define-primitive
 \ fixnum* { fixnum fixnum } { integer } define-primitive \ fixnum* make-foldable
diff --git a/core/bootstrap/primitives.factor b/core/bootstrap/primitives.factor
index 77572442be..ca5bb6f95d 100755
--- a/core/bootstrap/primitives.factor
+++ b/core/bootstrap/primitives.factor
@@ -345,8 +345,6 @@ tuple
     { "set-fpu-state" "kernel.private" ( -- ) }
     { "signal-handler" "kernel.private" ( -- ) }
     { "leaf-signal-handler" "kernel.private" ( -- ) }
-    { "ffi-signal-handler" "kernel.private" ( -- ) }
-    { "ffi-leaf-signal-handler" "kernel.private" ( -- ) }
     { "unwind-native-frames" "kernel.private" ( -- ) }
     { "set-callstack" "kernel.private" ( callstack -- * ) }
     { "lazy-jit-compile" "kernel.private" ( -- ) }
diff --git a/core/kernel/kernel.factor b/core/kernel/kernel.factor
index 7a1c21c110..faf1849373 100644
--- a/core/kernel/kernel.factor
+++ b/core/kernel/kernel.factor
@@ -41,8 +41,6 @@ PRIMITIVE: callstack-bounds ( -- start end )
 PRIMITIVE: check-datastack ( array in# out# -- ? )
 PRIMITIVE: compute-identity-hashcode ( obj -- )
 PRIMITIVE: context-object ( n -- obj )
-PRIMITIVE: ffi-leaf-signal-handler ( -- )
-PRIMITIVE: ffi-signal-handler ( -- )
 PRIMITIVE: fpu-state ( -- )
 PRIMITIVE: innermost-frame-executing ( callstack -- obj )
 PRIMITIVE: innermost-frame-scan ( callstack -- n )
@@ -369,8 +367,6 @@ CONSTANT: GET-FPU-STATE-WORD 46
 CONSTANT: SET-FPU-STATE-WORD 47
 CONSTANT: SIGNAL-HANDLER-WORD 48
 CONSTANT: LEAF-SIGNAL-HANDLER-WORD 49
-CONSTANT: FFI-SIGNAL-HANDLER-WORD 50
-CONSTANT: FFI-LEAF-SIGNAL-HANDLER-WORD 51
 
 CONSTANT: REDEFINITION-COUNTER 52
 
diff --git a/vm/objects.hpp b/vm/objects.hpp
index 1039960881..02b9f3de4c 100644
--- a/vm/objects.hpp
+++ b/vm/objects.hpp
@@ -64,8 +64,8 @@ enum special_object {
   SET_FPU_STATE_WORD,
   SIGNAL_HANDLER_WORD,
   LEAF_SIGNAL_HANDLER_WORD,
-  FFI_SIGNAL_HANDLER_WORD,
-  FFI_LEAF_SIGNAL_HANDLER_WORD,
+  UNUSED1,
+  UNUSED2,
 
   /* Incremented on every modify-code-heap call; invalidates call( inline
      caching */