diff --git a/common/hooks/post-install/07-rewrite-python-shebang.sh b/common/hooks/post-install/07-rewrite-python-shebang.sh
index 0443640954..8030e68035 100644
--- a/common/hooks/post-install/07-rewrite-python-shebang.sh
+++ b/common/hooks/post-install/07-rewrite-python-shebang.sh
@@ -15,7 +15,8 @@ hook() {
 	: ${pyver:=2.7}
 	shebang="#!/usr/bin/python$pyver"
 	find ${PKGDESTDIR} -type f -print0 | \
-		xargs -0 grep -l -m 1 "^#!.*\([[:space:]]\|/\)python\([[:space:]]\|$\)" -- | while IFS= read -r f; do
+		xargs -0 grep -H -b -m 1 "^#!.*\([[:space:]]\|/\)python\([[:space:]]\|$\)" -- | while IFS=: read -r f off _; do
+		[ "$off" -eq 0 ] || continue
 		if [ "$warn" ]; then
 			msg_warn "$pkgname: multiple python versions defined!"
 			msg_warn "$pkgname: using $pyver for shebang"