diff --git a/git-gui.sh b/git-gui.sh
index 2c7eb3c..29a790e 100755
--- a/git-gui.sh
+++ b/git-gui.sh
@@ -1348,6 +1348,9 @@
 proc bind_button3 {w cmd} {
 	bind $w <Any-Button-3> $cmd
 	if {[is_MacOSX]} {
+		# Mac OS X sends Button-2 on right click through three-button mouse,
+		# or through trackpad right-clicking (two-finger touch + click).
+		bind $w <Any-Button-2> $cmd
 		bind $w <Control-Button-1> $cmd
 	}
 }