diff --git a/extra/efivar/build b/extra/efivar/build
index d5d52cf9..67b980e3 100755
--- a/extra/efivar/build
+++ b/extra/efivar/build
@@ -17,5 +17,5 @@ mk() {
         "$@"
 }
 
-mk COMPILER=$CC
+mk COMPILER="$CC"
 mk install