diff --git a/packages/react-native-fantom/runner/runner.js b/packages/react-native-fantom/runner/runner.js
index 74c24e82126f4f..eb46e4653a4cac 100644
--- a/packages/react-native-fantom/runner/runner.js
+++ b/packages/react-native-fantom/runner/runner.js
@@ -24,7 +24,7 @@ import {
   getDebugInfoFromCommandResult,
   getShortHash,
   printConsoleLogs,
-  runBuck2,
+  runBuck2Sync,
   symbolicateStackTrace,
 } from './utils';
 import fs from 'fs';
@@ -43,7 +43,7 @@ const BUILD_OUTPUT_PATH = fs.mkdtempSync(
 
 const PRINT_FANTOM_OUTPUT: false = false;
 
-function parseRNTesterCommandResult(result: ReturnType<typeof runBuck2>): {
+function parseRNTesterCommandResult(result: ReturnType<typeof runBuck2Sync>): {
   logs: $ReadOnlyArray<ConsoleLogMessage>,
   testResult: TestSuiteResult,
 } {
@@ -99,7 +99,7 @@ function generateBytecodeBundle({
   bytecodePath: string,
   isOptimizedMode: boolean,
 }): void {
-  const hermesCompilerCommandResult = runBuck2(
+  const hermesCompilerCommandResult = runBuck2Sync(
     [
       'run',
       ...getBuckModesForPlatform(isOptimizedMode),
@@ -202,7 +202,7 @@ module.exports = async function runTest(
     });
   }
 
-  const rnTesterCommandResult = runBuck2([
+  const rnTesterCommandResult = runBuck2Sync([
     'run',
     ...getBuckModesForPlatform(
       testConfig.mode === FantomTestConfigMode.Optimized,
diff --git a/packages/react-native-fantom/runner/utils.js b/packages/react-native-fantom/runner/utils.js
index 97a486dcebaf3a..4e426a10cdaee9 100644
--- a/packages/react-native-fantom/runner/utils.js
+++ b/packages/react-native-fantom/runner/utils.js
@@ -44,24 +44,17 @@ export function getBuckModesForPlatform(
   return ['@//xplat/mode/react-force-cxx-platform', osPlatform];
 }
 
-type SpawnResultWithOriginalCommand = {
+type SyncCommandResult = {
   ...ReturnType<typeof spawnSync>,
   originalCommand: string,
   ...
 };
 
-export function runBuck2(args: Array<string>): SpawnResultWithOriginalCommand {
-  // If these tests are already running from withing a buck2 process, e.g. when
-  // they are scheduled by a `buck2 test` wrapper, calling `buck2` again would
-  // cause a daemon-level deadlock.
-  // To prevent this - explicitly pass custom `--isolation-dir`. Reuse the same
-  // dir across tests (even running in different jest processes) to properly
-  // employ caching.
-  if (process.env.BUCK2_WRAPPER != null) {
-    args.unshift('--isolation-dir', BUCK_ISOLATION_DIR);
-  }
-
-  const result = spawnSync('buck2', args, {
+export function runCommandSync(
+  command: string,
+  args: Array<string>,
+): SyncCommandResult {
+  const result = spawnSync(command, args, {
     encoding: 'utf8',
     env: {
       ...process.env,
@@ -71,12 +64,12 @@ export function runBuck2(args: Array<string>): SpawnResultWithOriginalCommand {
 
   return {
     ...result,
-    originalCommand: `buck2 ${args.join(' ')}`,
+    originalCommand: `${command} ${args.join(' ')}`,
   };
 }
 
 export function getDebugInfoFromCommandResult(
-  commandResult: SpawnResultWithOriginalCommand,
+  commandResult: SyncCommandResult,
 ): string {
   const maybeSignal =
     commandResult.signal != null ? `, signal: ${commandResult.signal}` : '';
@@ -102,6 +95,20 @@ export function getDebugInfoFromCommandResult(
   return logLines.join('\n');
 }
 
+export function runBuck2Sync(args: Array<string>): SyncCommandResult {
+  // If these tests are already running from withing a buck2 process, e.g. when
+  // they are scheduled by a `buck2 test` wrapper, calling `buck2` again would
+  // cause a daemon-level deadlock.
+  // To prevent this - explicitly pass custom `--isolation-dir`. Reuse the same
+  // dir across tests (even running in different jest processes) to properly
+  // employ caching.
+  if (process.env.BUCK2_WRAPPER != null) {
+    args.unshift('--isolation-dir', BUCK_ISOLATION_DIR);
+  }
+
+  return runCommandSync('buck2', args);
+}
+
 export function getShortHash(contents: string): string {
   return crypto.createHash('md5').update(contents).digest('hex').slice(0, 8);
 }
diff --git a/packages/react-native-fantom/runner/warmup/warmup.js b/packages/react-native-fantom/runner/warmup/warmup.js
index a5503c154ad0de..93a918e09446e5 100644
--- a/packages/react-native-fantom/runner/warmup/warmup.js
+++ b/packages/react-native-fantom/runner/warmup/warmup.js
@@ -12,7 +12,7 @@
 import {
   getBuckModesForPlatform,
   getDebugInfoFromCommandResult,
-  runBuck2,
+  runBuck2Sync,
 } from '../utils';
 // $FlowExpectedError[untyped-import]
 import fs from 'fs';
@@ -94,7 +94,7 @@ async function warmUpMetro(isOptimizedMode: boolean): Promise<void> {
 }
 
 function warmUpHermesCompiler(isOptimizedMode: boolean): void {
-  const buildHermesCompilerCommandResult = runBuck2([
+  const buildHermesCompilerCommandResult = runBuck2Sync([
     'build',
     ...getBuckModesForPlatform(isOptimizedMode),
     '//xplat/hermes/tools/hermesc:hermesc',
@@ -108,7 +108,7 @@ function warmUpHermesCompiler(isOptimizedMode: boolean): void {
 }
 
 function warmUpRNTesterCLI(isOptimizedMode: boolean): void {
-  const buildRNTesterCommandResult = runBuck2([
+  const buildRNTesterCommandResult = runBuck2Sync([
     'build',
     ...getBuckModesForPlatform(isOptimizedMode),
     '//xplat/ReactNative/react-native-cxx/samples/tester:tester',