diff --git a/minmea.c b/minmea.c
index 9cb585f..5ec6452 100644
--- a/minmea.c
+++ b/minmea.c
@@ -395,9 +395,9 @@ bool minmea_parse_gst(struct minmea_sentence_gst *frame, const char *sentence)
     if (!minmea_scan(sentence, "tTfffffff",
             type,
             &frame->time,
-            &frame->RMS_deviation,&frame->RMS_deviation_scale,
-            &frame->semi_major_sd,&frame->semi_major_sd_scale,
-            &frame->semi_minor_sd,&frame->semi_minor_sd_scale,
+            &frame->rms_deviation,&frame->rms_deviation_scale,
+            &frame->semi_major_deviation,&frame->semi_major_deviation_scale,
+            &frame->semi_minor_deviation,&frame->semi_minor_deviation_scale,
             &frame->semi_major_orientation,&frame->semi_major_orientation_scale,
             &frame->lattitude_error_deviation,&frame->lattitude_error_deviation_scale,
             &frame->longitude_error_deviation,&frame->longitude_error_deviation_scale,
diff --git a/minmea.h b/minmea.h
index 65c6e9f..5f84857 100644
--- a/minmea.h
+++ b/minmea.h
@@ -70,9 +70,9 @@ struct minmea_sentence_gga {
 
 struct minmea_sentence_gst {
     struct minmea_time time;
-    int RMS_deviation, RMS_deviation_scale;
-    int semi_major_sd, semi_major_sd_scale;
-    int semi_minor_sd, semi_minor_sd_scale;
+    int rms_deviation, rms_deviation_scale;
+    int semi_major_deviation, semi_major_deviation_scale;
+    int semi_minor_deviation, semi_minor_deviation_scale;
     int semi_major_orientation, semi_major_orientation_scale;
     int lattitude_error_deviation, lattitude_error_deviation_scale;
     int longitude_error_deviation, longitude_error_deviation_scale;