diff --git a/src/apps/showimage/ShowImageWindow.cpp b/src/apps/showimage/ShowImageWindow.cpp
index 0015b5f894..ae7a9faa31 100644
--- a/src/apps/showimage/ShowImageWindow.cpp
+++ b/src/apps/showimage/ShowImageWindow.cpp
@@ -1273,7 +1273,6 @@ ShowImageWindow::_ToggleFullScreen()
 		frame.top -= fBar->Bounds().Height() + 1;
 		frame.right += B_V_SCROLL_BAR_WIDTH;
 		frame.bottom += B_H_SCROLL_BAR_HEIGHT;
-		frame.InsetBy(-1, -1); // PEN_SIZE in ShowImageView
 
 		SetFlags(Flags() | B_NOT_RESIZABLE | B_NOT_MOVABLE);