diff --git a/Makefile.config b/Makefile.config
index a13165aa7..8f2b5208e 100644
--- a/Makefile.config
+++ b/Makefile.config
@@ -85,7 +85,8 @@ FEATURES_LIST	:= TCP_REPAIR STRLCPY STRLCAT PTRACE_PEEKSIGINFO \
 define gen-feature-test
 ifeq ($$(call try-cc,$$(FEATURE_TEST_$(1)),$$(LIBS_FEATURES),$$(DEFINES)),true)
 	$(Q) echo '#define CONFIG_HAS_$(1)' >> $$@
-	$(Q) echo '' >> $$@
+else
+	$(Q) echo '// CONFIG_HAS_$(1) is not set' >> $$@
 endif
 endef