diff --git a/tests/virschematest.c b/tests/virschematest.c
index 45960ba2826ac918b00a880631d38372677ab996..c9cc314c62e96a7dfc85ecfe39efc4a1b65ce94a 100644
--- a/tests/virschematest.c
+++ b/tests/virschematest.c
@@ -173,6 +173,8 @@ mymain(void)
     int ret = 0;
     struct testSchemaFileData data;
 
+    memset(&data, 0, sizeof(data));
+
 #define DO_TEST(sch, ...)                                                      \
     do {                                                                       \
         data.schema = sch;                                                     \