diff --git a/polymer/eduke32/build/include/build.h b/polymer/eduke32/build/include/build.h
index 7a3546514..00d0630bc 100644
--- a/polymer/eduke32/build/include/build.h
+++ b/polymer/eduke32/build/include/build.h
@@ -997,7 +997,7 @@ int32_t    preinitengine(void);	// a partial setup of the engine used for launch
 int32_t    initengine(void);
 void   uninitengine(void);
 void   initspritelists(void);
-int32_t   loadboard(char *filename, char flags, vec3_t *dapos, int16_t *daang, int16_t *dacursectnum);
+int32_t   loadboard(const char *filename, char flags, vec3_t *dapos, int16_t *daang, int16_t *dacursectnum);
 int32_t   loadmaphack(const char *filename);
 void delete_maphack_lights();
 #ifdef HAVE_CLIPSHAPE_FEATURE
@@ -1325,7 +1325,7 @@ int32_t loaddefinitionsfile(const char *fn);
 
 // if loadboard() fails with -2 return, try loadoldboard(). if it fails with
 // -2, board is dodgy
-int32_t loadoldboard(char *filename, char fromwhere, vec3_t *dapos, int16_t *daang, int16_t *dacursectnum);
+int32_t loadoldboard(const char *filename, char fromwhere, vec3_t *dapos, int16_t *daang, int16_t *dacursectnum);
 
 
 // Hash functions
diff --git a/polymer/eduke32/build/src/build.c b/polymer/eduke32/build/src/build.c
index a27e02af9..39bb3ebe3 100644
--- a/polymer/eduke32/build/src/build.c
+++ b/polymer/eduke32/build/src/build.c
@@ -8087,9 +8087,9 @@ int32_t LoadBoard(const char *filename, uint32_t flags)
     editorzrange[1] = INT32_MAX;
 
     ExtPreLoadMap();
-    i = loadboard(boardfilename, (flags&4)|loadingflags, &pos, &ang, &cursectnum);
+    i = loadboard(filename, (flags&4)|loadingflags, &pos, &ang, &cursectnum);
     if (i == -2)
-        i = loadoldboard(boardfilename,loadingflags, &pos, &ang, &cursectnum);
+        i = loadoldboard(filename,loadingflags, &pos, &ang, &cursectnum);
 
     if (i < 0)
     {
diff --git a/polymer/eduke32/build/src/engine.c b/polymer/eduke32/build/src/engine.c
index 1f7136092..dc3d94fd8 100644
--- a/polymer/eduke32/build/src/engine.c
+++ b/polymer/eduke32/build/src/engine.c
@@ -9870,7 +9870,7 @@ LUNATIC_CB int32_t (*loadboard_maptext)(int32_t fil, vec3_t *dapos, int16_t *daa
 //          -2: invalid version
 //          -3: invalid number of sectors, walls or sprites
 //       <= -4: map-text error
-int32_t loadboard(char *filename, char flags, vec3_t *dapos, int16_t *daang, int16_t *dacursectnum)
+int32_t loadboard(const char *filename, char flags, vec3_t *dapos, int16_t *daang, int16_t *dacursectnum)
 {
     int32_t fil, i;
     int16_t numsprites;
@@ -9878,8 +9878,6 @@ int32_t loadboard(char *filename, char flags, vec3_t *dapos, int16_t *daang, int
 
     flags &= 3;
 
-    i = Bstrlen(filename)-1;
-    if (filename[i] == 255) { filename[i] = 0; flags = 1; } // JBF 20040119: "compatibility"
     if ((fil = kopen4load(filename,flags)) == -1)
         { mapversion = 7; return -1; }
 
@@ -10066,7 +10064,7 @@ skip_reading_mapbin:
 
 // Powerslave uses v6
 // Witchaven 1 and TekWar and LameDuke use v5
-int32_t loadoldboard(char *filename, char fromwhere, vec3_t *dapos, int16_t *daang, int16_t *dacursectnum)
+int32_t loadoldboard(const char *filename, char fromwhere, vec3_t *dapos, int16_t *daang, int16_t *dacursectnum)
 {
     int32_t fil, i;
     int16_t numsprites;
@@ -10078,8 +10076,6 @@ int32_t loadoldboard(char *filename, char fromwhere, vec3_t *dapos, int16_t *daa
     struct walltypev6   v6wall;
     struct spritetypev6 v6spr;
 
-    i = Bstrlen(filename)-1;
-    if (filename[i] == 255) { filename[i] = 0; fromwhere = 1; } // JBF 20040119: "compatibility"
     if ((fil = kopen4load(filename,fromwhere)) == -1)
         { mapversion = 5L; return(-1); }