diff --git a/packages/core/src/parse-name.test.ts b/packages/core/src/parse-name.test.ts
index 236f7cd22..98b45f622 100644
--- a/packages/core/src/parse-name.test.ts
+++ b/packages/core/src/parse-name.test.ts
@@ -36,6 +36,22 @@ describe('parseWorkflowName', () => {
     });
   });
 
+  test('should handle Windows path with backslashes during workflow name normalization', () => {
+    // This tests the scenario from the bug report where the workflow name contains backslashes
+    const windowsWorkflowName = 'workflow//C:\\dev\\birthday-card-generator\\app\\api\\generate\\route.ts//handleOrder';
+    const normalizedName = windowsWorkflowName.replace(/\\/g, '/');
+    
+    // The normalized name should equal the expected format
+    expect(normalizedName).toBe('workflow//C:/dev/birthday-card-generator/app/api/generate/route.ts//handleOrder');
+    
+    const result = parseWorkflowName(normalizedName);
+    expect(result).toEqual({
+      shortName: 'handleOrder',
+      path: 'C:/dev/birthday-card-generator/app/api/generate/route.ts',
+      functionName: 'handleOrder',
+    });
+  });
+
   test('should parse workflow name with nested function names', () => {
     const result = parseWorkflowName(
       'workflow//src/app.ts//nested//function//name'
diff --git a/packages/core/src/workflow.test.ts b/packages/core/src/workflow.test.ts
index 93d868ede..1771d0662 100644
--- a/packages/core/src/workflow.test.ts
+++ b/packages/core/src/workflow.test.ts
@@ -2303,5 +2303,32 @@ describe('runWorkflow', () => {
         'sleep with date completed'
       );
     });
+
+    it('should handle Windows paths with backslashes in workflow names', async () => {
+      // Test the specific Windows path issue from the bug report
+      const workflowName = 'workflow//C:/dev/birthday-card-generator/app/api/generate/route.ts//handleOrder';
+      const workflowCode = `function handleOrder() { return "success from Windows"; }${getWorkflowTransformCode(workflowName)}`;
+
+      // Simulate the problematic workflow name with backslashes (as might occur on Windows)
+      const windowsWorkflowName = 'workflow//C:\\dev\\birthday-card-generator\\app\\api\\generate\\route.ts//handleOrder';
+      
+      const ops: Promise<any>[] = [];
+      const workflowRun: WorkflowRun = {
+        runId: 'wrun_windows_test',
+        workflowName: windowsWorkflowName, // Use the backslash version
+        status: 'running',
+        input: dehydrateWorkflowArguments([], ops),
+        createdAt: new Date('2024-01-01T00:00:00.000Z'),
+        updatedAt: new Date('2024-01-01T00:00:00.000Z'),
+        startedAt: new Date('2024-01-01T00:00:00.000Z'),
+        deploymentId: 'test-deployment',
+      };
+
+      const events: Event[] = [];
+
+      // This should work now because the workflow.ts normalizes the name before lookup
+      const result = await runWorkflow(workflowCode, workflowRun, events);
+      expect(result).toBe("success from Windows");
+    });
   });
 });
diff --git a/packages/core/src/workflow.ts b/packages/core/src/workflow.ts
index f27f4453f..bf646eb62 100644
--- a/packages/core/src/workflow.ts
+++ b/packages/core/src/workflow.ts
@@ -549,8 +549,13 @@ export async function runWorkflow(
     const parsedName = parseWorkflowName(workflowRun.workflowName);
     const filename = parsedName?.path || workflowRun.workflowName;
 
+    // Normalize the workflow name to handle Windows path separators
+    // The SWC transform normalizes paths to forward slashes during bundling,
+    // but the workflow name lookup might contain backslashes on Windows
+    const normalizedWorkflowName = workflowRun.workflowName.replace(/\\/g, '/');
+
     const workflowFn = runInContext(
-      `${workflowCode}; globalThis.__private_workflows?.get(${JSON.stringify(workflowRun.workflowName)})`,
+      `${workflowCode}; globalThis.__private_workflows?.get(${JSON.stringify(normalizedWorkflowName)})`,
       context,
       { filename }
     );
@@ -558,7 +563,7 @@ export async function runWorkflow(
     if (typeof workflowFn !== 'function') {
       throw new ReferenceError(
         `Workflow ${JSON.stringify(
-          workflowRun.workflowName
+          normalizedWorkflowName
         )} must be a function, but got "${typeof workflowFn}" instead`
       );
     }