diff --git a/tests/matrix-test.c b/tests/matrix-test.c
index 5b0513f..7b414c9 100644
--- a/tests/matrix-test.c
+++ b/tests/matrix-test.c
@@ -20,6 +20,8 @@
  * CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
  */
 
+#include "config.h"
+
 #include <stdio.h>
 #include <stdlib.h>
 #include <math.h>