diff --git a/src/object.c b/src/object.c
index ba2b95f..3c4034a 100644
--- a/src/object.c
+++ b/src/object.c
@@ -191,7 +191,12 @@ void stringStruct(struct string* s, const Object* obj)
 
     struct StructDef* def = getStructAt(so->definition);
     for (int i = 0; i < def->fieldCount; i++) {
-        appendf(s, " %s: ", def->names[i]);
+        appendf(s, " \"%s\": ", def->names[i]);
+        if (so->fields[i].type == TYPE_SYMBOL && so->fields[i].string == NULL) {
+            appendf(s, "null,");
+            continue;
+        }
+
         int isString = so->fields[i].type == TYPE_STRING;
         if (isString) {
             appendf(s, "\"");
diff --git a/src/tests.sh b/src/tests.sh
index dc569e3..ff954ec 100755
--- a/src/tests.sh
+++ b/src/tests.sh
@@ -206,7 +206,7 @@ title "Structs"
 check "Struct Definition" "(struct Post (title body))" "T"
 check "Building a struct"\
     '(struct Post (title body)) (Post "A title" "The Body")'\
-    '{ title: "A title", body: "The Body" }'
+    '{ "title": "A title", "body": "The Body" }'
 check "Accessing struct fields"\
     "(struct Post (title body)) (def p (Post \"TITLE\" \"BODY\")) (p.title p.body)"\
     "( TITLE BODY )"