diff --git a/git-gui/git-gui--askyesno b/git-gui/git-gui--askyesno
index 2a6e6fd11122f5..cf9c990d0919b3 100755
--- a/git-gui/git-gui--askyesno
+++ b/git-gui/git-gui--askyesno
@@ -20,8 +20,8 @@ if {$argc < 1} {
 }
 
 ${NS}::frame .t
-${NS}::label .t.m -text $prompt -justify center -width 40
-.t.m configure -wraplength 400
+${NS}::label .t.m -text $prompt -justify center -width 400px
+.t.m configure -wraplength 400px
 pack .t.m -side top -fill x -padx 20 -pady 20 -expand 1
 pack .t -side top -fill x -ipadx 20 -ipady 20 -expand 1