diff --git a/build.lua b/build.lua
index f1a1a20e3..5ab18b45e 100644
--- a/build.lua
+++ b/build.lua
@@ -1,5 +1,5 @@
 vars.cflags = {
-	"$CFLAGS"
+	"$(CFLAGS)"
 }
 vars.ackcflags = {
 	"-O6"