diff --git a/README.md b/README.md
index 3ae24be2a0..b5230b8d46 100644
--- a/README.md
+++ b/README.md
@@ -82,6 +82,9 @@ Arguments:
           The JavaScript file(s) to be evaluated
 
 Options:
+      --strict
+          Run in strict mode
+
   -a, --dump-ast [<FORMAT>]
           Dump the AST to stdout with the given format
 
diff --git a/boa_cli/src/main.rs b/boa_cli/src/main.rs
index b36c6d28c0..98d759f0d8 100644
--- a/boa_cli/src/main.rs
+++ b/boa_cli/src/main.rs
@@ -94,6 +94,10 @@ struct Opt {
     #[arg(name = "FILE", value_hint = ValueHint::FilePath)]
     files: Vec<PathBuf>,
 
+    /// Run in strict mode.
+    #[arg(long)]
+    strict: bool,
+
     /// Dump the AST to stdout with the given format.
     #[arg(
         long,
@@ -256,6 +260,9 @@ fn main() -> Result<(), io::Error> {
         .build()
         .expect("cannot fail with default global object");
 
+    // Strict mode
+    context.strict(args.strict);
+
     // Trace Output
     context.set_trace(args.trace);