diff --git a/include/cmake.mk b/include/cmake.mk
index b6e485eb4f..29c5aacb83 100644
--- a/include/cmake.mk
+++ b/include/cmake.mk
@@ -89,8 +89,8 @@ endif
 define Build/Configure/Default
 	mkdir -p $(CMAKE_BINARY_DIR)
 	(cd $(CMAKE_BINARY_DIR); \
-		CFLAGS="$(TARGET_CFLAGS) $(EXTRA_CFLAGS)" \
-		CXXFLAGS="$(TARGET_CXXFLAGS) $(EXTRA_CXXFLAGS)" \
+		CFLAGS="$(TARGET_CFLAGS) $(EXTRA_CFLAGS) $(TARGET_CPPFLAGS) $(EXTRA_CPPFLAGS)" \
+		CXXFLAGS="$(TARGET_CXXFLAGS) $(EXTRA_CXXFLAGS) $(TARGET_CPPFLAGS) $(EXTRA_CPPFLAGS)" \
 		LDFLAGS="$(TARGET_LDFLAGS) $(EXTRA_LDFLAGS)" \
 		cmake \
 			--no-warn-unused-cli \