diff --git a/extra/sequences/lib/lib.factor b/extra/sequences/lib/lib.factor
index 1beec90b75..4c0ea04f24 100755
--- a/extra/sequences/lib/lib.factor
+++ b/extra/sequences/lib/lib.factor
@@ -205,3 +205,6 @@ PRIVATE>
 
 : attempt-each ( seq quot -- result )
     (each) iterate-prep (attempt-each-integer) ; inline
+
+: replace ( seq old new -- newseq )
+    [ pick pick = [ 2nip ] [ 2drop ] if ] 2curry map ;
diff --git a/extra/tools/disassembler/disassembler.factor b/extra/tools/disassembler/disassembler.factor
index b74b2795cf..641eae90c2 100644
--- a/extra/tools/disassembler/disassembler.factor
+++ b/extra/tools/disassembler/disassembler.factor
@@ -2,7 +2,7 @@
 ! See http://factorcode.org/license.txt for BSD license.
 USING: io.files io words alien kernel math.parser alien.syntax
 io.launcher system assocs arrays sequences namespaces qualified
-regexp system math ;
+regexp system math sequences.lib ;
 QUALIFIED: unix
 IN: tools.disassembler
 
@@ -36,7 +36,7 @@ M: pair make-disassemble-cmd
     R/ 0x.*:.*/ matches? ;
 
 : tabs>spaces ( str -- str' )
-    [ dup CHAR: \t = [ drop CHAR: \s ] when ] map ;
+    CHAR: \t CHAR: \s replace ;
 
 : disassemble ( word -- )
     make-disassemble-cmd run-gdb
diff --git a/extra/unicode/data/data.factor b/extra/unicode/data/data.factor
index 3af3d927d7..419d3bcefd 100644
--- a/extra/unicode/data/data.factor
+++ b/extra/unicode/data/data.factor
@@ -1,6 +1,7 @@
-USING: assocs math kernel sequences io.files hashtables
-quotations splitting arrays math.parser combinators.lib hash2
-byte-arrays words namespaces words compiler.units parser ;
+USING: assocs math kernel sequences sequences.lib io.files
+hashtables quotations splitting arrays math.parser
+combinators.lib hash2 byte-arrays words namespaces words
+compiler.units parser ;
 IN: unicode.data
 
 <<
@@ -93,9 +94,6 @@ IN: unicode.data
 : ascii-lower ( string -- lower )
     [ dup CHAR: A CHAR: Z between? [ HEX: 20 + ] when ] map ;
 
-: replace ( seq old new -- newseq )
-    swap rot [ 2dup = [ drop over ] when ] map 2nip ;
-
 : process-names ( data -- names-hash )
     1 swap (process-data)
     [ ascii-lower CHAR: \s CHAR: - replace swap ] assoc-map