diff --git a/libavutil/Makefile b/libavutil/Makefile
index 18dc5f22d9..410ac636f7 100644
--- a/libavutil/Makefile
+++ b/libavutil/Makefile
@@ -262,6 +262,6 @@ TESTPROGS-$(HAVE_LZO1X_999_COMPRESS) += lzo
 TOOLS = crypto_bench ffhash ffeval ffescape
 
 tools/crypto_bench$(EXESUF): ELIBS += $(if $(VERSUS),$(subst +, -l,+$(VERSUS)),)
-tools/crypto_bench$(EXESUF): CFLAGS += -DUSE_EXT_LIBS=0$(if $(VERSUS),$(subst +,+USE_,+$(VERSUS)),)
+tools/crypto_bench.o: CFLAGS += -DUSE_EXT_LIBS=0$(if $(VERSUS),$(subst +,+USE_,+$(VERSUS)),)
 
 $(SUBDIR)tests/lzo$(EXESUF): ELIBS = -llzo2