diff --git a/php-pecl-xdebug3.spec b/php-pecl-xdebug3.spec
index 35bb6f2..e1cbcf1 100644
--- a/php-pecl-xdebug3.spec
+++ b/php-pecl-xdebug3.spec
@@ -180,6 +180,11 @@ done
 : check if provided config file is usable
 %{__php} \
     --no-php-ini \
+    -d extension_dir=%{buildroot}%{php_extdir} \
+    -c %{buildroot}%{php_inidir}/%{ini_name} -v
+%{__php} \
+    --no-php-ini \
+    -d extension_dir=%{buildroot}%{php_extdir} \
     -c %{buildroot}%{php_inidir}/%{ini_name} -v 2>err.log \
         | grep 'with Xdebug v%{upstream_version}%{?upstream_prever}'
 if [ -s err.log ]; then