diff --git a/std/json.d b/std/json.d
index 9125e0a..c69b096 100644
--- a/std/json.d
+++ b/std/json.d
@@ -1140,7 +1140,8 @@ string toJSON(in JSONValue* root, in bool pretty = false, in JSONOptions options
                     }
                 }
                 else {
-                    json.put(to!string(val));
+                    import std.format : format;
+                    json.put("%f".format(val));
                 }
                 break;