diff --git a/src/map.c b/src/map.c
index d368ad8..ba56538 100644
--- a/src/map.c
+++ b/src/map.c
@@ -219,6 +219,11 @@ static void map_mouse(SDL_Event* event, double mx, double my) {
 
   switch(event->type) {
   case SDL_MOUSEBUTTONDOWN:
+    if(event->button.button == SDL_BUTTON_WHEELUP)
+      map_buttonZoom("btnZoomOut");
+    else if(event->button.button == SDL_BUTTON_WHEELDOWN)
+      map_buttonZoom("btnZoomIn");
+
     // Selecting star system.
     for(i = 0; i < systems_nstack; i++) {
       x = systems_stack[i].pos.x * map_zoom;