diff --git a/Rules.mak b/Rules.mak
index 84baa97..571da05 100644
--- a/Rules.mak
+++ b/Rules.mak
@@ -158,7 +158,7 @@ endif
 comma:=,
 space:= #
 
-ifndef CROSS_COMPILE
+ifeq ($(CROSS_COMPILE),)
 CROSS_COMPILE=$(call qstrip,$(CROSS_COMPILER_PREFIX))
 endif