diff --git a/save-xml.c b/save-xml.c
index d6774b5c7..4183b1c51 100644
--- a/save-xml.c
+++ b/save-xml.c
@@ -162,7 +162,7 @@ static void show_location(FILE *f, struct dive *dive)
 	 */
 	if (latitude || longitude) {
 		int len = snprintf(buffer, sizeof(buffer)-4,
-			"  <location gps='%f %f'>",
+			"  <location gps='%.12g %.12g'>",
 			latitude, longitude);
 		if (!dive->location) {
 			memcpy(&buffer[len-1], "/>\n", 4);