diff --git a/src/g_demo.c b/src/g_demo.c
index 0fbd920c6..f602e2752 100644
--- a/src/g_demo.c
+++ b/src/g_demo.c
@@ -2294,10 +2294,13 @@ static void G_LoadDemoExtraFiles(UINT8 **pp)
 			}
 			else
 			{
-				P_AddWadFile(filename);
+				P_PartialAddWadFile(filename);
 			}
 		}
 	}
+
+	if (P_PartialAddGetStage() >= 0)
+		P_MultiSetupWadFiles(true); // in case any partial adds were done
 }
 
 static void G_SkipDemoExtraFiles(UINT8 **pp)