diff --git a/packages/graphics/Mesa-master/build b/packages/graphics/Mesa-master/build
index bb9d5709d9..a5e46eb480 100755
--- a/packages/graphics/Mesa-master/build
+++ b/packages/graphics/Mesa-master/build
@@ -14,7 +14,7 @@ $SCRIPTS/build libX11
 
 get_graphicdrivers
 
-if [ $MESA_GLU = yes ]; then
+if [ "$MESA_GLU" = yes ]; then
   MESA_CONFIG="$MESA_CONFIG --enable-glu"
 else
   MESA_CONFIG="$MESA_CONFIG --disable-glu"
@@ -59,6 +59,6 @@ make -C progs/xdemos
 
 $MAKEINSTALL -C src/mesa
 
-if [ $MESA_GLU = yes ]; then
+if [ "$MESA_GLU" = "yes" ]; then
   $MAKEINSTALL -C src/glu
 fi
\ No newline at end of file