diff --git a/Cargo.lock b/Cargo.lock
index c1a7a02..4bf8de1 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -25,7 +25,7 @@ checksum = "f538837af36e6f6a9be0faa67f9a314f8119e4e4b5867c6ab40ed60360142519"
 
 [[package]]
 name = "argc"
-version = "1.17.0"
+version = "1.18.0"
 dependencies = [
  "anyhow",
  "assert_cmd",
diff --git a/Cargo.toml b/Cargo.toml
index d63691f..1f86936 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -1,6 +1,6 @@
 [package]
 name = "argc"
-version = "1.17.0"
+version = "1.18.0"
 edition = "2021"
 authors = ["sigoden <sigoden@gmail.com>"]
 description = "A bash cli framework, also a bash-based command runner"
diff --git a/src/build.rs b/src/build.rs
index b72fc3f..67db52b 100644
--- a/src/build.rs
+++ b/src/build.rs
@@ -13,7 +13,7 @@ const UTIL_FNS: [(&str, &str); 6] = [
 _argc_take_args() {
     _argc_take_args_values=()
     _argc_take_args_len=0
-    local param="${{1:-}}" min="${{2:-}}" max="${{3:-}}" signs="${{4:-}}" delimiter="${{5:-}}"
+    local param="${1:-}" min="${2:-}" max="${3:-}" signs="${4:-}" delimiter="${5:-}"
     if [[ "$min" -eq 0 ]] && [[ "$max" -eq 0 ]]; then
         return
     fi