diff --git a/terrainrenderer.go b/terrainrenderer.go
index ea35496..cfd3837 100644
--- a/terrainrenderer.go
+++ b/terrainrenderer.go
@@ -42,12 +42,13 @@ func (r *terrainRenderer) Handle(ctx *Context, event sdl.Event) bool {
 	case *sdl.MouseButtonEvent:
 		if r.project.windowInteractRect.IsPointInside(e.X, e.Y) {
 			if e.Type == sdl.MOUSEBUTTONDOWN {
-				if e.Button == sdl.BUTTON_MIDDLE || (e.Button == sdl.BUTTON_LEFT && isControlKeyDown()) {
+				controlKeyDown := isControlKeyDown()
+				if e.Button == sdl.BUTTON_MIDDLE || (e.Button == sdl.BUTTON_LEFT && controlKeyDown) {
 					if !r.drag.IsDragging() {
 						r.drag.Start(Pt(e.X, e.Y))
 					}
 				}
-				if e.Button == sdl.BUTTON_LEFT {
+				if e.Button == sdl.BUTTON_LEFT && !controlKeyDown {
 					pos := r.project.screenToMapInt(e.X, e.Y)
 					r.game.UserClickedTile(pos)
 				}