diff --git a/src/cli.rs b/src/cli.rs
index 2108a1d..5c8e238 100644
--- a/src/cli.rs
+++ b/src/cli.rs
@@ -43,15 +43,6 @@ pub(crate) struct Args {
     )]
     pub platform: Option<PlatformType>,
 
-    /// Deprecated alias of `platform`
-    #[clap(
-        short = 'o',
-        long = "os",
-        possible_values = ["linux", "macos", "windows", "sunos", "osx"],
-        hide = true
-    )]
-    pub os: Option<PlatformType>,
-
     /// Override the language
     #[clap(short = 'L', long = "language")]
     pub language: Option<String>,
diff --git a/src/main.rs b/src/main.rs
index 156eba6..f4a4687 100644
--- a/src/main.rs
+++ b/src/main.rs
@@ -269,13 +269,6 @@ fn main() {
             "The -m / --markdown flag is deprecated, use -r / --raw instead",
         );
     }
-    if args.os.is_some() {
-        print_warning(
-            enable_styles,
-            "The -o / --os flag is deprecated, use -p / --platform instead",
-        );
-    }
-    args.platform = args.platform.or(args.os);
 
     // Look up config file, if none is found fall back to default config.
     let config = match Config::load(enable_styles) {