diff --git a/main.cpp b/main.cpp
index 5db57e0..53be1ff 100644
--- a/main.cpp
+++ b/main.cpp
@@ -33,6 +33,10 @@ int main(int argc, char *argv[])
         {
             if (e.type == SDL_QUIT) { should_exit=true; break; }
             if (z80debug::debugging()) {
+                if ((e.type==SDL_WINDOWEVENT) && ((e.window.event==SDL_WINDOWEVENT_SHOWN) || (e.window.event==SDL_WINDOWEVENT_EXPOSED))) {
+                    z80debug::refresh();
+                    zxscreen::refresh();
+                }
                 if (e.type == SDL_KEYDOWN) {
                     if (e.key.keysym.scancode==SDL_SCANCODE_ESCAPE) {
                         should_exit=true; break;