diff --git a/src/sentry_webhook/post_sentry_event_to_salesforce.spec.ts b/src/sentry_webhook/post_sentry_event_to_salesforce.spec.ts
index d9cc3cb8e..008ae0311 100644
--- a/src/sentry_webhook/post_sentry_event_to_salesforce.spec.ts
+++ b/src/sentry_webhook/post_sentry_event_to_salesforce.spec.ts
@@ -92,7 +92,7 @@ describe('postSentryEventToSalesforce', () => {
       message: 'my message',
       tags: [
         ['category', 'test category'],
-        ['os.name', 'test os'],
+        ['os.name', 'Mac OS X'],
         ['sentry:release', 'test version'],
         ['unknown:tag', 'foo'],
       ],
@@ -109,7 +109,7 @@ describe('postSentryEventToSalesforce', () => {
         '&description=my%20message' +
         '&type=Outline%20client' +
         '&00N0b00000BqOA2=test%20category' +
-        '&00N0b00000BqOfW=test%20os' +
+        '&00N0b00000BqOfW=macOs' +
         '&00N0b00000BqOfR=test%20version'
     );
     expect(mockRequest.end).toHaveBeenCalled();
diff --git a/src/sentry_webhook/post_sentry_event_to_salesforce.ts b/src/sentry_webhook/post_sentry_event_to_salesforce.ts
index c8056e996..45883043c 100644
--- a/src/sentry_webhook/post_sentry_event_to_salesforce.ts
+++ b/src/sentry_webhook/post_sentry_event_to_salesforce.ts
@@ -142,7 +142,7 @@ function getSalesforceFormData(
   if (event.tags) {
     const tags = new Map<string, string>(event.tags);
     form.push(encodeFormData(formFields.category, tags.get('category')));
-    form.push(encodeFormData(formFields.os, tags.get('os.name')));
+    form.push(encodeFormData(formFields.os, toOSPicklistValue(tags.get('os.name'))));
     form.push(encodeFormData(formFields.version, tags.get('sentry:release')));
     if (!isClient) {
       form.push(encodeFormData(formFields.cloudProvider, tags.get('cloudProvider')));
@@ -151,6 +151,29 @@ function getSalesforceFormData(
   return form.join('&');
 }
 
+// Returns a picklist value that is allowed by SalesForce for the OS record.
+function toOSPicklistValue(value: string | undefined): string | undefined {
+  if (!value) {
+    console.warn('No OS found');
+    return undefined;
+  }
+
+  const normalizedValue = value.toLowerCase();
+  if (normalizedValue.includes('android')) {
+    return 'Android';
+  }
+  if (normalizedValue.includes('ios')) {
+    return 'iOS';
+  }
+  if (normalizedValue.includes('windows')) {
+    return 'Windows';
+  }
+  if (normalizedValue.includes('mac')) {
+    return 'macOs';
+  }
+  return 'Linux';
+}
+
 function encodeFormData(field: string, value?: string) {
   return `${encodeURIComponent(field)}=${encodeURIComponent(value || '')}`;
 }