diff --git a/components/ulp/component_ulp_common.mk b/components/ulp/component_ulp_common.mk
index 70e5b0205b..e051af0789 100644
--- a/components/ulp/component_ulp_common.mk
+++ b/components/ulp/component_ulp_common.mk
@@ -81,7 +81,7 @@ build: $(COMPONENT_BUILD_DIR)/$(ULP_EXPORTS_HEADER) \
 $(ULP_EXP_DEP_OBJECTS) : $(ULP_EXPORTS_HEADER) $(ULP_SYM)
 
 # Finally, set all the variables processed by the build system. 
-COMPONENT_EXTRA_CLEAN := $(ULP_OBJECTS) \
+COMPONENT_EXTRA_CLEAN += $(ULP_OBJECTS) \
 			$(ULP_LD_SCRIPT) \
 			$(ULP_PREPROCESSED) \
 			$(ULP_ELF) $(ULP_BIN) \
@@ -91,6 +91,6 @@ COMPONENT_EXTRA_CLEAN := $(ULP_OBJECTS) \
 			$(ULP_DEP) \
 			$(ULP_LISTINGS)
 
-COMPONENT_EMBED_FILES := $(COMPONENT_BUILD_DIR)/$(ULP_BIN)
-COMPONENT_ADD_LDFLAGS := -l$(COMPONENT_NAME) -T $(COMPONENT_BUILD_DIR)/$(ULP_EXPORTS_LD)
-COMPONENT_EXTRA_INCLUDES := $(COMPONENT_BUILD_DIR)
+COMPONENT_EMBED_FILES += $(COMPONENT_BUILD_DIR)/$(ULP_BIN)
+COMPONENT_ADD_LDFLAGS += -l$(COMPONENT_NAME) -T $(COMPONENT_BUILD_DIR)/$(ULP_EXPORTS_LD)
+COMPONENT_EXTRA_INCLUDES += $(COMPONENT_BUILD_DIR)