diff --git a/packages/opencode/src/cli/cmd/tui/app.tsx b/packages/opencode/src/cli/cmd/tui/app.tsx
index ea742f699708..27fb64d88214 100644
--- a/packages/opencode/src/cli/cmd/tui/app.tsx
+++ b/packages/opencode/src/cli/cmd/tui/app.tsx
@@ -74,6 +74,7 @@ function rendererConfig(_config: TuiConfig.Info): CliRendererConfig {
   return {
     externalOutputMode: "passthrough",
     targetFps: 60,
+    widthMethod: _config.width_method,
     gatherStats: false,
     exitOnCtrlC: false,
     useKittyKeyboard: {},
diff --git a/packages/opencode/src/cli/cmd/tui/config/tui-schema.ts b/packages/opencode/src/cli/cmd/tui/config/tui-schema.ts
index ed79e8e52418..4c658a9e2067 100644
--- a/packages/opencode/src/cli/cmd/tui/config/tui-schema.ts
+++ b/packages/opencode/src/cli/cmd/tui/config/tui-schema.ts
@@ -24,6 +24,12 @@ export const TuiOptions = z.object({
     .optional()
     .describe("Control diff rendering style: 'auto' adapts to terminal width, 'stacked' always shows single column"),
   mouse: z.boolean().optional().describe("Enable or disable mouse capture (default: true)"),
+  width_method: z
+    .enum(["unicode", "wcwidth", "no_zwj"])
+    .optional()
+    .describe(
+      "Character width calculation method. Use 'no_zwj' if ZWJ emoji sequences cause layout corruption in your terminal (common with tmux and older terminals). Default: 'unicode'",
+    ),
 })
 
 export const TuiInfo = z