diff --git a/include/mgba/script/types.h b/include/mgba/script/types.h
index b5f52d2dd..9e2fad9fd 100644
--- a/include/mgba/script/types.h
+++ b/include/mgba/script/types.h
@@ -23,11 +23,11 @@ CXX_GUARD_START
 #define mSCRIPT_TYPE_C_S64 int64_t
 #define mSCRIPT_TYPE_C_U64 uint64_t
 #define mSCRIPT_TYPE_C_F64 double
-#define mSCRIPT_TYPE_C_STR mScriptString*
+#define mSCRIPT_TYPE_C_STR struct mScriptString*
 #define mSCRIPT_TYPE_C_CHARP const char*
 #define mSCRIPT_TYPE_C_PTR void*
 #define mSCRIPT_TYPE_C_TABLE Table*
-#define mSCRIPT_TYPE_C_WRAPPER mScriptValue*
+#define mSCRIPT_TYPE_C_WRAPPER struct mScriptValue*
 #define mSCRIPT_TYPE_C_S(STRUCT) struct STRUCT*
 
 #define mSCRIPT_TYPE_FIELD_S32 s32
diff --git a/src/script/types.c b/src/script/types.c
index e8f1a73a2..b5fef71e1 100644
--- a/src/script/types.c
+++ b/src/script/types.c
@@ -598,11 +598,10 @@ void mScriptValueRef(struct mScriptValue* val) {
 }
 
 void mScriptValueDeref(struct mScriptValue* val) {
-	--val->refs;
-	if (val->refs > 0) {
+	if (val->refs > 1) {
+		--val->refs;
 		return;
-	} else if (val->refs < 0) {
-		val->refs = mSCRIPT_VALUE_UNREF;
+	} else if (val->refs <= 0) {
 		return;
 	}
 	if (val->type->free) {