diff --git a/src/playsim/p_acs.cpp b/src/playsim/p_acs.cpp
index 7a8516eee..e2bdf3b85 100644
--- a/src/playsim/p_acs.cpp
+++ b/src/playsim/p_acs.cpp
@@ -5261,7 +5261,7 @@ int DLevelScript::SwapActorTeleFog(AActor *activator, int tid)
 			if (rettype == TypeSInt32 || rettype == TypeBool || rettype == TypeColor || rettype == TypeName || rettype == TypeSound)
 			{
 				VMReturn ret(&retval);
-				VMCall(func, &params[0], params.Size(), &ret, 1);
+				VMCallWithDefaults(func, params, &ret, 1);
 				if (rettype == TypeName)
 				{
 					retval = GlobalACSStrings.AddString(FName(ENamedName(retval)).GetChars());