diff --git a/autogen.sh b/autogen.sh
index bff8257b..91d4b09d 100755
--- a/autogen.sh
+++ b/autogen.sh
@@ -48,7 +48,7 @@ fi
 }
 
 LIBTOOLIZE=`which libtoolize`
-if ! test -f $LIBTOOLIZE; then
+if ! test -f "$LIBTOOLIZE"; then
 	LIBTOOLIZE=`which glibtoolize`
 fi