diff --git a/core/sequences/sequences.factor b/core/sequences/sequences.factor
index 967fcbbdc8..ee38d30750 100755
--- a/core/sequences/sequences.factor
+++ b/core/sequences/sequences.factor
@@ -257,7 +257,7 @@ INSTANCE: repetition immutable-sequence
 
 : check-copy ( src n dst -- )
     over 0 < [ bounds-error ] when
-    >r swap length + r> lengthen ;
+    >r swap length + r> lengthen ; inline
 
 PRIVATE>