diff --git a/Makefile.toml b/Makefile.toml
index 2ba8629..257c76d 100644
--- a/Makefile.toml
+++ b/Makefile.toml
@@ -41,7 +41,24 @@ command = "cargo"
 args = ["clippy", "--", "--deny", "warnings"]
 
 [tasks.header-add]
-script = { file = "./scripts/add_header_if_missing.sh" }
+script = [
+    "if [ \"$#\" -lt 2 ]; then",
+    "  echo 'Usage: $0 <header-file> <file-pattern>'",
+    "  exit 1",
+    "fi",
+    "HEADER_FILE=\"$1\"",
+    "FILE_PATTERN=\"$2\"",
+    "LICENSE_HEADER=$(cat \"$HEADER_FILE\")",
+    "shopt -s globstar",
+    "for file in $FILE_PATTERN; do",
+    "  if [[ -f \"$file\" && \"$file\" == *.rs ]]; then",
+    "    if ! grep -q 'Copyright 2024, Horizen Labs, Inc.' \"$file\"; then",
+    "      echo 'Adding license header to $file'",
+    "      echo -e \"$LICENSE_HEADER\\n$(cat $file)\" > \"$file\"",
+    "    fi",
+    "  fi",
+    "done"
+]
 args = ["HEADER-APACHE2", "./!(target)/**/*.rs"]
 
 [tasks.header-check]