diff --git a/pkgs/build-support/setup-hooks/patch-shebangs.sh b/pkgs/build-support/setup-hooks/patch-shebangs.sh
index 0553eb04b111..f22da254a791 100644
--- a/pkgs/build-support/setup-hooks/patch-shebangs.sh
+++ b/pkgs/build-support/setup-hooks/patch-shebangs.sh
@@ -24,7 +24,7 @@ fixupOutputHooks+=(patchShebangsAuto)
 
 patchShebangs() {
     local pathName
-    local update
+    local update=false
 
     while [[ $# -gt 0 ]]; do
         case "$1" in