diff --git a/openwrt/tools/mtd-utils/Makefile b/openwrt/tools/mtd-utils/Makefile
index f67ccf758fb..bc15f0a6719 100644
--- a/openwrt/tools/mtd-utils/Makefile
+++ b/openwrt/tools/mtd-utils/Makefile
@@ -19,7 +19,7 @@ PKG_BUILD_DIR:=$(TOOL_BUILD_DIR)/$(PKG_NAME)-$(PKG_VERSION).orig
 include $(INCLUDE_DIR)/host-build.mk
 
 CFLAGS := $(HOSTCFLAGS) -O2 -I../include
-ifneq ($(OS),Linux)
+ifneq ($(HOST_OS),Linux)
 CFLAGS += -Dloff_t=off_t -D__BYTE_ORDER=BYTE_ORDER -I$(STAGING_DIR)/include-host -include getline.h -include endian.h
 endif
 
diff --git a/openwrt/tools/sstrip/Makefile b/openwrt/tools/sstrip/Makefile
index dc3ff4f6da5..4e409e0d8dc 100644
--- a/openwrt/tools/sstrip/Makefile
+++ b/openwrt/tools/sstrip/Makefile
@@ -10,7 +10,7 @@ include $(INCLUDE_DIR)/host-build.mk
 PKG_BUILD_DIR:=$(TOOL_BUILD_DIR)/sstrip
 
 OS:=$(shell uname)
-ifeq ($(OS),Darwin)
+ifeq ($(HOST_OS),Darwin)
   CFLAGS += -I./include
 endif