diff --git a/tests.c b/tests.c
index fff286d..f55e17a 100644
--- a/tests.c
+++ b/tests.c
@@ -508,7 +508,7 @@ START_TEST(test_minmea_parse_gga1)
 {
     const char *sentence = "$GPGGA,123519,4807.038,N,01131.000,E,1,08,0.9,545.4,M,46.9,M,,*47";
     struct minmea_sentence_gga frame = {};
-    static const struct minmea_sentence_gga expected = {
+    struct minmea_sentence_gga expected = {
         .time = { 12, 35, 19, 0 },
         .latitude = { 4807038, 1000 },
         .longitude = { 1131000, 1000 },
@@ -519,11 +519,13 @@ START_TEST(test_minmea_parse_gga1)
         .altitude_units = 'M',
         .height = { 469, 10 },
         .height_units = 'M',
-        .dgps_age = { 0, 10 },
+        .dgps_age = { 0, 0 },
     };
     ck_assert(minmea_check(sentence, false) == true);
     ck_assert(minmea_check(sentence, true) == true);
     ck_assert(minmea_parse_gga(&frame, sentence) == true);
+    memset(&expected.altitude_units + 1, 0, 3);
+	memset(&expected.height_units + 1, 0, 3);
     ck_assert(!memcmp(&frame, &expected, sizeof(frame)));
 }
 END_TEST