diff --git a/autogen.sh b/autogen.sh
index f6e453d0..e222a6cd 100755
--- a/autogen.sh
+++ b/autogen.sh
@@ -27,7 +27,7 @@
 #
 # All the rest is auto-generated.
 
-if [ $1 == "clean" ]; then
+if [ "$1" == "clean" ]; then
     echo "Cleaning..."
     rm configure aclocal.m4
     rm m4/*