diff --git a/win/Qt/qt_map.cpp b/win/Qt/qt_map.cpp
index 3eb766866..64fb2ea02 100644
--- a/win/Qt/qt_map.cpp
+++ b/win/Qt/qt_map.cpp
@@ -6,6 +6,8 @@
 
 extern "C" {
 #include "hack.h"
+
+extern glyph_map glyphmap[MAX_GLYPH]; /* from tile.c */
 }
 
 #include "qt_pre.h"
@@ -500,14 +502,14 @@ void NetHackQtMapViewport::Clear()
         Glyphttychar(0, j) = ' ';
         Glyphcolor(0, j) = NO_COLOR;
         Glyphflags(0, j) = 0U;
-        Glyphtileidx(0, j) = 0;
+        Glyphtileidx(0, j) = ::glyphmap[GLYPH_NOTHING].tileidx;
 
         for (int i = 1; i < COLNO; ++i) {
             Glyph(i, j) = GLYPH_UNEXPLORED;
             Glyphttychar(i, j) = ' ';
             Glyphcolor(i, j) = NO_COLOR;
             Glyphflags(i, j) = 0U;
-            Glyphtileidx(i, j) = 0;
+            Glyphtileidx(i, j) = ::glyphmap[GLYPH_UNEXPLORED].tileidx;
         }
     }