diff --git a/wrapper/build.sh b/wrapper/build.sh
index 17fb7cb..d4d5c92 100755
--- a/wrapper/build.sh
+++ b/wrapper/build.sh
@@ -93,7 +93,7 @@ if [ -n "$BWPLATFORM" ]; then
 
   [ -z "$BWCOMPILEONLY" ] && BWCOMPILEONLY=1
 else
-  [ -z "$PORTABLE"] && FLAGS="$CXXFLAGS "
+  [ -z "$PORTABLE" ] && FLAGS="$CXXFLAGS "
 fi
 
 if [ -n "$BWCXX" ]; then