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-rw-r--r--src/viewport_func.h2
1 files changed, 1 insertions, 1 deletions
diff --git a/src/viewport_func.h b/src/viewport_func.h
index 466a24a3b..9461f3df5 100644
--- a/src/viewport_func.h
+++ b/src/viewport_func.h
@@ -27,7 +27,7 @@ Point TranslateXYToTileCoord(const Viewport *vp, int x, int y, bool clamp_to_map
Point GetTileBelowCursor();
void UpdateViewportPosition(Window *w);
-void MarkAllViewportsDirty(int left, int top, int right, int bottom);
+bool MarkAllViewportsDirty(int left, int top, int right, int bottom);
bool DoZoomInOutWindow(ZoomStateChange how, Window *w);
void ZoomInOrOutToCursorWindow(bool in, Window * w);