diff --git a/source/common/searchpaths.cpp b/source/common/searchpaths.cpp
index aa5aa4c08..9c85d0da0 100644
--- a/source/common/searchpaths.cpp
+++ b/source/common/searchpaths.cpp
@@ -847,13 +847,13 @@ TArray<GrpInfo> ParseAllGrpInfos(TArray<FileEntry>& filelist)
 	engine_res.reset(FResourceFile::OpenResourceFile(baseres, true, true));
 	if (engine_res)
 	{
-		auto basegrp = engine_res->FindLump("demolition/demolition.grpinfo");
+		auto basegrp = engine_res->FindLump("demolition/grpinfo.txt");
 		if (basegrp)
 		{
 			auto fr = basegrp->NewReader();
 			if (fr.isOpen())
 			{
-				groups = ParseGrpInfo("demolition/demolition.grpinfo", fr, CRCMap);
+				groups = ParseGrpInfo("demolition/grpinfo.txt", fr, CRCMap);
 			}
 		}
 	}
diff --git a/wadsrc/static/demolition/demolition.grpinfo b/wadsrc/static/demolition/grpinfo.txt
similarity index 100%
rename from wadsrc/static/demolition/demolition.grpinfo
rename to wadsrc/static/demolition/grpinfo.txt