diff --git a/core/sequences/sequences-tests.factor b/core/sequences/sequences-tests.factor
index 2aa95b23ab..e36bfaf9d2 100644
--- a/core/sequences/sequences-tests.factor
+++ b/core/sequences/sequences-tests.factor
@@ -293,4 +293,4 @@ USE: make
 [ 1 { "a" "b" "c" } [ [ dup , ] [ , ] interleave drop ] { } make ] unit-test
 
 [ t ] [ 0 array-capacity? ] unit-test
-[ f ] [ -1 array-capacity? ] unit-test
\ No newline at end of file
+[ f ] [ -1 array-capacity? ] unit-test
diff --git a/core/sequences/sequences.factor b/core/sequences/sequences.factor
index 031d5f7b4a..177a157994 100755
--- a/core/sequences/sequences.factor
+++ b/core/sequences/sequences.factor
@@ -919,7 +919,7 @@ PRIVATE>
 <PRIVATE
 
 : generic-flip ( matrix -- newmatrix )
-    [ dup first length [ length min ] reduce ] keep
+    [ dup first length [ length min ] reduce iota ] keep
     [ [ nth-unsafe ] with { } map-as ] curry { } map-as ; inline
 
 USE: arrays
@@ -929,7 +929,7 @@ USE: arrays
 
 : array-flip ( matrix -- newmatrix )
     { array } declare
-    [ dup first array-length [ array-length min ] reduce ] keep
+    [ dup first array-length [ array-length min ] reduce iota ] keep
     [ [ { array } declare array-nth ] with { } map-as ] curry { } map-as ;
 
 PRIVATE>