diff --git a/json.c b/json.c
index f3062b3..01b018c 100644
--- a/json.c
+++ b/json.c
@@ -117,7 +117,7 @@ void json_add_long(Json* json, long value)
 void json_add_double(Json* json, double value)
 {
     begin_value(json);
-    fprintf(json->stream, "%f", value);
+    fprintf(json->stream, "%g", value);
     end_value(json);
 }