diff --git a/source/duke3d/src/gamedef.cpp b/source/duke3d/src/gamedef.cpp
index c21ab517e..eea0ec11d 100644
--- a/source/duke3d/src/gamedef.cpp
+++ b/source/duke3d/src/gamedef.cpp
@@ -6295,6 +6295,7 @@ static void C_AddDefaultDefinitions(void)
         { "STR_PARTIME", STR_PARTIME },
         { "STR_DESIGNERTIME", STR_DESIGNERTIME },
         { "STR_BESTTIME", STR_BESTTIME },
+        { "STR_USERMAPFILENAME", STR_USERMAPFILENAME },
 
         { "MAXSTATUS", MAXSTATUS },
         { "MAXSPRITES", MAXSPRITES },
diff --git a/source/duke3d/src/gamedef.h b/source/duke3d/src/gamedef.h
index 0a86ddc0b..b671400f1 100644
--- a/source/duke3d/src/gamedef.h
+++ b/source/duke3d/src/gamedef.h
@@ -218,6 +218,7 @@ enum SystemString_t {
     STR_PARTIME,
     STR_DESIGNERTIME,
     STR_BESTTIME,
+    STR_USERMAPFILENAME,
 };
 
 enum ScriptError_t
diff --git a/source/duke3d/src/gameexec.cpp b/source/duke3d/src/gameexec.cpp
index 86763f3c9..2d0343e90 100644
--- a/source/duke3d/src/gameexec.cpp
+++ b/source/duke3d/src/gameexec.cpp
@@ -2357,6 +2357,9 @@ skip_check:
                     case STR_BESTTIME:
                         Bstrcpy(apStrings[i],G_PrintBestTime());
                         break;
+                    case STR_USERMAPFILENAME:
+                        Bstrcpy(apStrings[i],boardfilename);
+                        break;
                     default:
                         CON_ERRPRINTF("invalid string index %d or %d\n", i, j);
                     }