diff --git a/utils/test-pkg b/utils/test-pkg
index aa91ee02cf..e4f68ed061 100755
--- a/utils/test-pkg
+++ b/utils/test-pkg
@@ -129,7 +129,7 @@ build_one() {
 
     mkdir -p "${dir}"
 
-    support/kconfig/merge_config.sh -O "${dir}" \
+    CONFIG_= support/kconfig/merge_config.sh -O "${dir}" \
         "${toolchainconfig}" "support/config-fragments/minimal.config" "${cfg}" \
         >> "${dir}/logfile" 2>&1
     # We want all the options from the snippet to be present as-is (set