diff --git a/tests/otr/mock_otr.c b/tests/otr/mock_otr.c
index 8a063b99..e73d0ba2 100644
--- a/tests/otr/mock_otr.c
+++ b/tests/otr/mock_otr.c
@@ -6,6 +6,9 @@
 #include <string.h>
 #include <glib.h>
 
+
+#include "config.h"
+
 #ifdef HAVE_LIBOTR
 #include "otr/otr.h"
 #endif