diff --git a/auto/func b/auto/func
index acbab9c95..fcbbe0183 100644
--- a/auto/func
+++ b/auto/func
@@ -19,7 +19,7 @@ int main() {
 
 END
 
-eval "$CC $CC_TEST_FLAGS -o $NGX_AUTOTEST $NGX_AUTOTEST.c $ngx_func_libs \
+eval "$CC_WARN $CC_TEST_FLAGS -o $NGX_AUTOTEST $NGX_AUTOTEST.c $ngx_func_libs \
      >> $NGX_ERR 2>&1"
 
 if [ -x $NGX_AUTOTEST ]; then
diff --git a/auto/init b/auto/init
index 50971dd58..8bd4b8b07 100644
--- a/auto/init
+++ b/auto/init
@@ -7,6 +7,8 @@ NGX_MODULES_C=$OBJS/ngx_modules.c
 NGX_AUTOTEST=$OBJS/autotest
 NGX_ERR=$OBJS/autoconf.err
 
+CC_WARN=$CC
+
 
 # checking echo's "-n" option and "\c" capabilties