diff --git a/core/io/crc32/crc32-docs.factor b/core/io/crc32/crc32-docs.factor
index 020f2668b0..3855c77cd8 100644
--- a/core/io/crc32/crc32-docs.factor
+++ b/core/io/crc32/crc32-docs.factor
@@ -2,16 +2,16 @@ USING: help.markup help.syntax math ;
 IN: io.crc32
 
 HELP: crc32
-{ $values { "seq" "a sequence" } { "n" integer } }
+{ $values { "seq" "a sequence of bytes" } { "n" integer } }
 { $description "Computes the CRC32 checksum of a sequence of bytes." } ;
 
-HELP: file-crc32
-{ $values { "path" "a pathname string" } { "n" integer } }
-{ $description "Computes the CRC32 checksum of a file's contents." } ;
+HELP: lines-crc32
+{ $values { "lines" "a sequence of strings" } { "n" integer } }
+{ $description "Computes the CRC32 checksum of a sequence of lines of bytes." } ;
 
 ARTICLE: "io.crc32" "CRC32 checksum calculation"
 "The CRC32 checksum algorithm provides a quick but unreliable way to detect changes in data."
 { $subsection crc32 }
-{ $subsection file-crc32 } ;
+{ $subsection lines-crc32 } ;
 
 ABOUT: "io.crc32"
diff --git a/core/io/crc32/crc32.factor b/core/io/crc32/crc32.factor
index b83943df48..afe7e4bfb7 100755
--- a/core/io/crc32/crc32.factor
+++ b/core/io/crc32/crc32.factor
@@ -23,8 +23,6 @@ IN: io.crc32
 : crc32 ( seq -- n )
     >r HEX: ffffffff dup r> [ (crc32) ] each bitxor ;
 
-: file-crc32 ( path -- n ) file-contents crc32 ;
-
 : lines-crc32 ( seq -- n )
     HEX: ffffffff tuck [
         [ (crc32) ] each CHAR: \n (crc32)
diff --git a/core/io/streams/c/c.factor b/core/io/streams/c/c.factor
index b02c3367d4..288ab212d1 100755
--- a/core/io/streams/c/c.factor
+++ b/core/io/streams/c/c.factor
@@ -74,3 +74,10 @@ M: object <file-writer>
 
 M: object <file-appender>
     "ab" fopen <c-writer> <plain-writer> ;
+
+: show ( msg -- )
+    #! A word which directly calls primitives. It is used to
+    #! print stuff from contexts where the I/O system would
+    #! otherwise not work (tools.deploy.shaker, the I/O
+    #! multiplexer thread).
+    "\r\n" append stdout-handle fwrite stdout-handle fflush ;
diff --git a/core/source-files/source-files.factor b/core/source-files/source-files.factor
index 8bbf329491..c974145928 100755
--- a/core/source-files/source-files.factor
+++ b/core/source-files/source-files.factor
@@ -17,7 +17,7 @@ uses definitions ;
 
 : (source-modified?) ( path modified checksum -- ? )
     pick file-modified rot [ 0 or ] 2apply >
-    [ swap file-crc32 number= not ] [ 2drop f ] if ;
+    [ swap file-lines lines-crc32 = not ] [ 2drop f ] if ;
 
 : source-modified? ( path -- ? )
     dup source-files get at [
diff --git a/extra/tools/deploy/shaker/shaker.factor b/extra/tools/deploy/shaker/shaker.factor
index f2b951ad16..16507232ae 100755
--- a/extra/tools/deploy/shaker/shaker.factor
+++ b/extra/tools/deploy/shaker/shaker.factor
@@ -8,11 +8,6 @@ debugger io.streams.c io.streams.duplex io.files io.backend
 quotations words.private tools.deploy.config compiler.units ;
 IN: tools.deploy.shaker
 
-: show ( msg -- )
-    #! Use primitives directly so that we can print stuff even
-    #! after most of the image has been stripped away
-    "\r\n" append stdout-handle fwrite stdout-handle fflush ;
-
 : strip-init-hooks ( -- )
     "Stripping startup hooks" show
     "command-line" init-hooks get delete-at