diff --git a/nixos/modules/installer/tools/nixos-rebuild.sh b/nixos/modules/installer/tools/nixos-rebuild.sh
index 2d137dd52add..d7b749573fa9 100644
--- a/nixos/modules/installer/tools/nixos-rebuild.sh
+++ b/nixos/modules/installer/tools/nixos-rebuild.sh
@@ -1,5 +1,7 @@
 #! @shell@
 
+if [ -x "@shell@" ]; then export SHELL="@shell@"; fi;
+
 set -e
 
 showSyntax() {