diff --git a/git-gui/git-gui.sh b/git-gui/git-gui.sh
index 784ddb7aee..876a72f1eb 100755
--- a/git-gui/git-gui.sh
+++ b/git-gui/git-gui.sh
@@ -1225,6 +1225,9 @@ set have_tk85 [expr {[package vcompare $tk_version "8.5"] >= 0}]
 if {![info exists env(SSH_ASKPASS)]} {
 	set env(SSH_ASKPASS) [gitexec git-gui--askpass]
 }
+if {![info exists env(GIT_ASKPASS)]} {
+	set env(GIT_ASKPASS) [gitexec git-gui--askpass]
+}
 if {![info exists env(GIT_ASK_YESNO)]} {
 	set env(GIT_ASK_YESNO) [gitexec git-gui--askyesno]
 }