diff --git a/tools/bc/patches/002-fix-libmath.patch b/tools/bc/patches/002-fix-libmath.patch
index 1a8439542da..f2212f0953f 100644
--- a/tools/bc/patches/002-fix-libmath.patch
+++ b/tools/bc/patches/002-fix-libmath.patch
@@ -10,7 +10,7 @@
 -w
 -q
 -EOS-EOS
-+#! /bin/bash
++#!/usr/bin/env bash
 +sed -e '1   s/^/{"/' \
 +    -e     's/$/",/' \
 +    -e '2,$ s/^/"/'  \