diff --git a/core/Makefile b/core/Makefile
index d9f9a25..3ed33dc 100644
--- a/core/Makefile
+++ b/core/Makefile
@@ -23,8 +23,13 @@
 $(if $(filter %.apk, $(1)),$(error \
     Prebuilt apk found in PRODUCT_COPY_FILES: $(1), use BUILD_PREBUILT instead!))
 endef
-unique_product_copy_files_destinations :=
+# filter out the duplicate <source file>:<dest file> pairs.
+unique_product_copy_files_pairs :=
 $(foreach cf,$(PRODUCT_COPY_FILES), \
+    $(if $(filter $(unique_product_copy_files_pairs),$(cf)),,\
+        $(eval unique_product_copy_files_pairs += $(cf))))
+unique_product_copy_files_destinations :=
+$(foreach cf,$(unique_product_copy_files_pairs), \
     $(eval _src := $(call word-colon,1,$(cf))) \
     $(eval _dest := $(call word-colon,2,$(cf))) \
     $(call check-product-copy-files,$(cf)) \
@@ -36,6 +41,7 @@
             $(eval $(call copy-one-file,$(_src),$(_fulldest)))) \
         $(eval ALL_DEFAULT_INSTALLED_MODULES += $(_fulldest)) \
         $(eval unique_product_copy_files_destinations += $(_dest))))
+unique_product_copy_files_pairs :=
 unique_product_copy_files_destinations :=
 
 # -----------------------------------------------------------------