diff --git a/tools/24-bit-color.sh b/tools/24-bit-color.sh
index 73cff60a..b83ef51f 100644
--- a/tools/24-bit-color.sh
+++ b/tools/24-bit-color.sh
@@ -14,7 +14,7 @@
 # https://github.com/gnachman/iTerm2/blob/master/LICENSE
 #
 
-if which gseq >/dev/null
+if which gseq >/dev/null 2>&1
 then
     SEQ=gseq
 else