diff --git a/Makefile.inc b/Makefile.inc
index 99923df46e1..f8a980bd4fe 100644
--- a/Makefile.inc
+++ b/Makefile.inc
@@ -48,7 +48,7 @@ else
   S = -s
 endif
 
-zephyrmake	= @$(MAKE) -C $(ZEPHYR_BASE)  O=$(1) CFLAGS="$(CFLAGS)" \
+zephyrmake	= @$(MAKE) -C $(ZEPHYR_BASE)  O=$(1) CFLAGS=$(CFLAGS) \
 			PROJECT=$(PROJECT_BASE) SOURCE_DIR=$(SOURCE_DIR) $(2)
 
 DOTCONFIG = $(O)/.config