diff --git a/src/gamedata/resourcefiles/resourcefile.cpp b/src/gamedata/resourcefiles/resourcefile.cpp
index c0acfc2cfe7..d5bf8d95ac4 100644
--- a/src/gamedata/resourcefiles/resourcefile.cpp
+++ b/src/gamedata/resourcefiles/resourcefile.cpp
@@ -135,7 +135,7 @@ void FResourceLump::LumpNameSetup(FString iname)
 	// Since '\' can't be used as a file name's part inside a ZIP
 	// we have to work around this for sprites because it is a valid
 	// frame character.
-	else if (Namespace == ns_sprites || Namespace == ns_voxels || Namespace == ns_hires)
+	else if (Namespace == ns_sprites || Namespace == ns_hires_sprites || Namespace == ns_voxels || Namespace == ns_hires)
 	{
 		char *c;