diff --git a/LEGO1/mxstreamcontroller.cpp b/LEGO1/mxstreamcontroller.cpp
index d6beaa8b..e219f357 100644
--- a/LEGO1/mxstreamcontroller.cpp
+++ b/LEGO1/mxstreamcontroller.cpp
@@ -44,7 +44,7 @@ MxResult MxStreamController::vtable0x1C(undefined4 p_unknown, undefined4 p_unkno
 }
 
 // OFFSET: LEGO1 0x100c1690 STUB
-long MxStreamController::vtable0x20(MxDSAction* action)
+MxResult MxStreamController::vtable0x20(MxDSAction* action)
 {
   // TODO STUB
   return FAILURE;
diff --git a/LEGO1/mxstreamcontroller.h b/LEGO1/mxstreamcontroller.h
index 26a22d38..0f459ed0 100644
--- a/LEGO1/mxstreamcontroller.h
+++ b/LEGO1/mxstreamcontroller.h
@@ -33,7 +33,7 @@ class MxStreamController : public MxCore
   virtual MxResult Open(const char *p_filename); // vtable+0x14
   virtual MxResult vtable0x18(undefined4 p_unknown, undefined4 p_unknown2); //vtable+0x18
   virtual MxResult vtable0x1C(undefined4 p_unknown, undefined4 p_unknown2); //vtable+0x1c
-  virtual long vtable0x20(MxDSAction* action); //vtable+0x20
+  virtual MxResult vtable0x20(MxDSAction* action); //vtable+0x20
 
   MxBool FUN_100c20d0(MxDSObject &p_obj);