diff --git a/guess-rev.sh b/guess-rev.sh
index 2e567b310..5884bad48 100755
--- a/guess-rev.sh
+++ b/guess-rev.sh
@@ -5,5 +5,5 @@ REV=unknown
 
 which svnversion > /dev/null 2>&1 && REV=`svnversion -n`
 
-echo -n $REV
+`which echo` -n $REV