diff --git a/direct/src/interval/MetaInterval.py b/direct/src/interval/MetaInterval.py
index b6b87a03cd..24c61dcd2d 100644
--- a/direct/src/interval/MetaInterval.py
+++ b/direct/src/interval/MetaInterval.py
@@ -112,7 +112,7 @@ class MetaInterval(CMetaInterval):
         if isinstance(other, MetaInterval):
             self.ivals += other.ivals
         else:
-            self.ivals += list(other.ivals)
+            self.ivals += list(other)
         self.__ivalsDirty = 1
         return self