diff --git a/src/g_mapinfo.cpp b/src/g_mapinfo.cpp
index 4d7b3c7d2..5a39d7dbb 100644
--- a/src/g_mapinfo.cpp
+++ b/src/g_mapinfo.cpp
@@ -312,8 +312,13 @@ FString level_info_t::LookupLevelName()
 			{
 				mysnprintf (checkstring, countof(checkstring), "%d: ", atoi(&MapName[5]));
 			}
+			else
+			{
+				// make sure nothing is stripped.
+				checkstring[0] = '\0';
+			}
 			thename = strstr (lookedup, checkstring);
-			if (thename == NULL)
+			if (thename == NULL || thename == lookedup)
 			{
 				thename = lookedup;
 			}