diff --git a/packages/opencode/src/cli/cmd/tui/app.tsx b/packages/opencode/src/cli/cmd/tui/app.tsx
index 4b177e292cf..a7f8a5eb26b 100644
--- a/packages/opencode/src/cli/cmd/tui/app.tsx
+++ b/packages/opencode/src/cli/cmd/tui/app.tsx
@@ -115,6 +115,12 @@ export function tui(input: {
       resolve()
     }
 
+    // Prevent SIGINT from immediately terminating process on Windows
+    // exitOnCtrlC: false tells opentui not to exit, but Node still receives SIGINT
+    // Empty handler prevents default termination, letting keyboard handlers work
+    const noopHandler = () => {}
+    process.on("SIGINT", noopHandler)
+
     render(
       () => {
         return (