diff --git a/test/regress.c b/test/regress.c
index 21a0cd40..5f5c9af8 100644
--- a/test/regress.c
+++ b/test/regress.c
@@ -28,6 +28,10 @@
  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  */
 
+#ifdef HAVE_CONFIG_H
+#include "config.h"
+#endif
+
 #include <sys/types.h>
 #include <sys/stat.h>
 #include <sys/time.h>