diff --git a/tools/build-gtk-stack b/tools/build-gtk-stack
index 4c6dc25d6d..1047822898 100644
--- a/tools/build-gtk-stack
+++ b/tools/build-gtk-stack
@@ -53,7 +53,7 @@ mkdir -p $PREFIX
 export MAKEFLAGS=-j2
 PATH=$PREFIX/bin:$PATH
 
-if uname -a | grep -s arwin ; then
+if uname -a | grep --silent arwin ; then
     
     # its OS X! run for the hills !!