diff --git a/packages/opencode/src/cli/cmd/run.ts b/packages/opencode/src/cli/cmd/run.ts
index 3bf89954ae..76fb44fe5c 100644
--- a/packages/opencode/src/cli/cmd/run.ts
+++ b/packages/opencode/src/cli/cmd/run.ts
@@ -51,6 +51,7 @@ export const RunCommand = cmd({
         type: "string",
       })
       .option("fork-session", {
+        alias: ["F"],
         describe: "fork the session before continuing (requires --continue or --session)",
         type: "boolean",
       })
diff --git a/packages/opencode/src/cli/cmd/tui/thread.ts b/packages/opencode/src/cli/cmd/tui/thread.ts
index 3df0140e0f..4240528739 100644
--- a/packages/opencode/src/cli/cmd/tui/thread.ts
+++ b/packages/opencode/src/cli/cmd/tui/thread.ts
@@ -65,7 +65,7 @@ export const TuiThreadCommand = cmd({
         describe: "session id to continue",
       })
       .option("fork-session", {
-        alias: ["f"],
+        alias: ["F"],
         type: "boolean",
         describe: "fork the session when continuing (use with --continue or --session)",
       })