diff --git a/Makefile b/Makefile
index c99778af..76e60170 100644
--- a/Makefile
+++ b/Makefile
@@ -59,7 +59,7 @@ fuzz_testing_cbor:
 	mkdir -p fuzz-testing fuzz-testing/testcases fuzz-testing/out
 	$(MAKE) parse_cbor_fuzzer -C test CXX=afl-clang++
 	mv test/parse_cbor_fuzzer fuzz-testing/fuzzer
-	find test/data -size -5k -name *cbor | xargs -I{} cp "{}" fuzz-testing/testcases
+	find test/data -size -5k -name *.cbor | xargs -I{} cp "{}" fuzz-testing/testcases
 	@echo "Execute: afl-fuzz -i fuzz-testing/testcases -o fuzz-testing/out fuzz-testing/fuzzer"