1 files changed, 1 insertions, 1 deletions

diff --git a/src/Screen.cc b/src/Screen.cc
index 3ef27a6..7af00a7 100644
--- a/src/Screen.cc
+++ b/src/Screen.cc
@@ -2234,7 +2234,7 @@ int BScreen::getHead(int x, int y) const {
     return 0;
 }
 
-int BScreen::getHead(FbTk::FbWindow &win) const {
+int BScreen::getHead(const FbTk::FbWindow &win) const {
     if (hasXinerama())
         return getHead(win.x() + win.width()/2, win.y() + win.height()/2);
     else