diff --git a/config.cpp b/config.cpp
index f61ba510..49c28823 100644
--- a/config.cpp
+++ b/config.cpp
@@ -1567,7 +1567,7 @@ void show_color_dialog() {
       else if(c->item) 
         dialog::openColorDialog(iinf[c->item].color);
       else if(c->wall) 
-        dialog::openColorDialog(winf[c->wall].color);
+        dialog::openColorDialog(winf[c->wall == waMineMine ? waMineUnknown : c->wall].color);
       else 
         dialog::openColorDialog(floorcolors[c->land]);
       dialog::colorAlpha = false;
diff --git a/graph.cpp b/graph.cpp
index 50b9db61..b6fc5733 100644
--- a/graph.cpp
+++ b/graph.cpp
@@ -2749,6 +2749,9 @@ void setcolors(cell *c, color_t& wcol, color_t& fcol) {
 
   wcol = fcol = winf[c->wall].color;
 
+  if(c->wall == waMineMine)
+    wcol = fcol = winf[waMineUnknown].color;
+
   // water colors
   if(isWateryOrBoat(c) || c->wall == waReptileBridge) {
     if(c->land == laOcean)