diff --git a/polkadot/parachain/test-chains/basic_add/build.sh b/polkadot/parachain/test-chains/basic_add/build.sh
index 965913f495..f25f775d43 100755
--- a/polkadot/parachain/test-chains/basic_add/build.sh
+++ b/polkadot/parachain/test-chains/basic_add/build.sh
@@ -1,4 +1,4 @@
-#!/bin/bash
+#!/usr/bin/env bash
 set -e
 
 # Make LLD produce a binary that imports memory from the outside environment.
diff --git a/polkadot/parachain/test-chains/build.sh b/polkadot/parachain/test-chains/build.sh
index d46a635613..6bd7552661 100755
--- a/polkadot/parachain/test-chains/build.sh
+++ b/polkadot/parachain/test-chains/build.sh
@@ -1,4 +1,4 @@
-#!/bin/bash
+#!/usr/bin/env bash
 set -e
 
 rm -rf ./target
diff --git a/polkadot/runtime/wasm/build.sh b/polkadot/runtime/wasm/build.sh
index 8920ca8bbb..88010211f9 100755
--- a/polkadot/runtime/wasm/build.sh
+++ b/polkadot/runtime/wasm/build.sh
@@ -1,4 +1,4 @@
-#!/bin/bash
+#!/usr/bin/env bash
 set -e
 
 cargo +nightly build --target=wasm32-unknown-unknown --release