diff --git a/examples/headsail-bsp-ffi/Justfile b/examples/headsail-bsp-ffi/Justfile
index 4eb0f0ad..026d4f37 100644
--- a/examples/headsail-bsp-ffi/Justfile
+++ b/examples/headsail-bsp-ffi/Justfile
@@ -1,7 +1,7 @@
 build-sysctrl:
     cargo build --target=riscv32imc-unknown-none-elf -Fpanic-uart
-    sh weaken_compiler_builtins.sh
+    ./weaken_compiler_builtins.sh
 
 build-hpc:
     cargo build --target=riscv64imac-unknown-none-elf -Fpanic-uart
-    sh weaken_compiler_builtins.sh
+    ./weaken_compiler_builtins.sh
diff --git a/examples/headsail-bsp-ffi/weaken_compiler_builtins.sh b/examples/headsail-bsp-ffi/weaken_compiler_builtins.sh
index 8c32cf93..5a0b8681 100755
--- a/examples/headsail-bsp-ffi/weaken_compiler_builtins.sh
+++ b/examples/headsail-bsp-ffi/weaken_compiler_builtins.sh
@@ -1,3 +1,4 @@
+#!/bin/bash
 mkdir -p tmp/
 cd tmp
 ARCH=riscv64-unknown-elf