diff --git a/polymer/eduke32/build/include/polymost.h b/polymer/eduke32/build/include/polymost.h
index 88cac7960..67f46c3b0 100644
--- a/polymer/eduke32/build/include/polymost.h
+++ b/polymer/eduke32/build/include/polymost.h
@@ -28,6 +28,8 @@ struct glfiltermodes {
 #define NUMGLFILTERMODES 6
 extern struct glfiltermodes glfiltermodes[NUMGLFILTERMODES];
 
+extern void Polymost_prepare_loadboard(void);
+
 //void phex(char v, char *s);
 void uploadtexture(int32_t doalloc, vec2_t siz, int32_t texfmt, coltype *pic, vec2_t tsiz, int32_t dameth);
 void polymost_drawsprite(int32_t snum);
diff --git a/polymer/eduke32/build/src/engine.c b/polymer/eduke32/build/src/engine.c
index cde65d8a5..039d00f97 100644
--- a/polymer/eduke32/build/src/engine.c
+++ b/polymer/eduke32/build/src/engine.c
@@ -8937,6 +8937,11 @@ static void prepare_loadboard(int32_t fil, vec3_t *dapos, int16_t *daang, int16_
     Bmemset(spritechanged, 0, sizeof(spritechanged));
     Bmemset(wallchanged, 0, sizeof(wallchanged));
 
+#ifdef USE_OPENGL
+    if (getrendermode() == REND_POLYMOST)
+        Polymost_prepare_loadboard();
+#endif
+
     if (!have_maptext())
     {
         kread(fil,&dapos->x,4); dapos->x = B_LITTLE32(dapos->x);
diff --git a/polymer/eduke32/build/src/polymost.c b/polymer/eduke32/build/src/polymost.c
index 9f7f09cb2..0501d7dc7 100644
--- a/polymer/eduke32/build/src/polymost.c
+++ b/polymer/eduke32/build/src/polymost.c
@@ -4278,6 +4278,11 @@ typedef struct
 
 wallspriteinfo_t wsprinfo[MAXSPRITES];
 
+void Polymost_prepare_loadboard(void)
+{
+    Bmemset(wsprinfo, 0, sizeof(wsprinfo));
+}
+
 static inline int32_t polymost_findwall(uspritetype const * const tspr, vec2_t const * const tsiz, int32_t * rd)
 {
     int32_t dist = 4, closest = -1;