diff --git a/src/testing.c b/src/testing.c
index fd55927..1835643 100644
--- a/src/testing.c
+++ b/src/testing.c
@@ -1132,6 +1132,10 @@
 	    if (argvars[0].vval.v_dict != NULL)
 		retval = argvars[0].vval.v_dict->dv_refcount - 1;
 	    break;
+	case VAR_TYPEALIAS:
+	    if (argvars[0].vval.v_typealias != NULL)
+		retval = argvars[0].vval.v_typealias->ta_refcount - 1;
+	    break;
     }
 
     rettv->v_type = VAR_NUMBER;