diff --git a/backend/src/services/identity-aws-auth/identity-aws-auth-validators.ts b/backend/src/services/identity-aws-auth/identity-aws-auth-validators.ts
index 098bdcf9a..527d508f5 100644
--- a/backend/src/services/identity-aws-auth/identity-aws-auth-validators.ts
+++ b/backend/src/services/identity-aws-auth/identity-aws-auth-validators.ts
@@ -4,7 +4,10 @@ import { z } from "zod";
 
 const twelveDigitRegex = new RE2(/^\d{12}$/);
 // akhilmhdh: change this to a normal function later. Checked no redosable at the moment
-const arnRegex = new RE2(/^arn:aws:iam::\d{12}:(user\/[a-zA-Z0-9_.@+*/-]+|role\/[a-zA-Z0-9_.@+*/-]+|\*)$/);
+
+const arnRegex = new RE2(
+  /^arn:aws:iam::\d{12}:(user\/[a-zA-Z0-9_.@+*/-]+|role\/[a-zA-Z0-9_.@+*/-]+|assume-role\/[a-zA-Z0-9_.@+*/-]+|\*)$/
+);
 
 export const validateAccountIds = z
   .string()
@@ -52,7 +55,7 @@ export const validatePrincipalArns = z
     },
     {
       message:
-        "Each ARN must be in the format of 'arn:aws:iam::123456789012:user/UserName', 'arn:aws:iam::123456789012:role/RoleName', or 'arn:aws:iam::123456789012:*'."
+        "Each ARN must be in the format of 'arn:aws:iam::123456789012:user/UserName', 'arn:aws:iam::123456789012:role/RoleName', 'arn:aws:iam::123456789012:assume-role/RoleName', or 'arn:aws:iam::123456789012:*'."
     }
   )
   // Transform to normalize the spaces around commas