diff --git a/minmea.h b/minmea.h
index 494b218..a77381e 100644
--- a/minmea.h
+++ b/minmea.h
@@ -92,6 +92,15 @@ struct minmea_sentence_gga {
     struct minmea_float dgps_age;
 };
 
+enum minmea_gga_fix_quality {
+    MINMEA_GGA_FIX_QUALITY_NO_FIX = 0,
+    MINMEA_GGA_FIX_QUALITY_GPS = 1,
+    MINMEA_GGA_FIX_QUALITY_DIFFERENTIAL_GPS = 2,
+    MINMEA_GGA_FIX_QUALITY_RTK_FIXED = 4,
+    MINMEA_GGA_FIX_QUALITY_RTK_FLOAT = 5,
+    MINMEA_GGA_FIX_QUALITY_ESTIMATED_DR = 6
+};
+
 enum minmea_gll_status {
     MINMEA_GLL_STATUS_DATA_VALID = 'A',
     MINMEA_GLL_STATUS_DATA_NOT_VALID = 'V',
diff --git a/tests.c b/tests.c
index b5e067e..0a7eecf 100644
--- a/tests.c
+++ b/tests.c
@@ -377,7 +377,7 @@ START_TEST(test_minmea_scan_complex1)
     ck_assert_int_eq(longitude.value, 1131000);
     ck_assert_int_eq(longitude.scale, 1000);
     ck_assert_int_eq(longitude_direction, 1);
-    ck_assert_int_eq(fix_quality, 1);
+    ck_assert_int_eq(fix_quality, MINMEA_GGA_FIX_QUALITY_GPS);
     ck_assert_int_eq(satellites, 8);
     ck_assert_int_eq(hdop.value, 9);
     ck_assert_int_eq(hdop.scale, 10);
@@ -562,7 +562,7 @@ START_TEST(test_minmea_parse_gga1)
     expected.time = (struct minmea_time) { 12, 35, 19, 0 };
     expected.latitude = (struct minmea_float) { 4807038, 1000 };
     expected.longitude = (struct minmea_float) { 1131000, 1000 };
-    expected.fix_quality = 1;
+    expected.fix_quality = MINMEA_GGA_FIX_QUALITY_GPS;
     expected.satellites_tracked = 8;
     expected.hdop = (struct minmea_float) { 9, 10 };
     expected.altitude = (struct minmea_float) { 5454, 10 };