diff --git a/Makefile b/Makefile
index cd0806e1e6..83f1df5502 100644
--- a/Makefile
+++ b/Makefile
@@ -955,7 +955,7 @@ FOUND_SOURCE_FILES := $(filter-out $(GENERATED_H),$(shell $(SOURCES_CMD)))
 FOUND_C_SOURCES = $(filter %.c,$(FOUND_SOURCE_FILES))
 FOUND_H_SOURCES = $(filter %.h,$(FOUND_SOURCE_FILES))
 
-COCCI_SOURCES = $(filter-out $(THIRD_PARTY_SOURCES),$(FOUND_C_SOURCES))
+COCCI_SOURCES = $(filter-out $(THIRD_PARTY_SOURCES) reftable/%,$(FOUND_C_SOURCES))
 
 LIB_H = $(FOUND_H_SOURCES)