diff --git a/prowler/providers/aws/aws_provider.py b/prowler/providers/aws/aws_provider.py
index 6aae6a42..9d034b58 100644
--- a/prowler/providers/aws/aws_provider.py
+++ b/prowler/providers/aws/aws_provider.py
@@ -256,16 +256,14 @@ def get_checks_from_input_arn(audit_resources: list, provider: str) -> set:
     return sorted(checks_from_arn)
 
 
-def get_regions_from_audit_resources(audit_resources: list) -> list:
+def get_regions_from_audit_resources(audit_resources: list) -> set:
     """get_regions_from_audit_resources gets the regions from the audit resources arns"""
-    audited_regions = []
+    audited_regions = set()
     for resource in audit_resources:
         region = resource.split(":")[3]
-        if region and region not in audited_regions:  # Check if arn has a region
-            audited_regions.append(region)
-    if audited_regions:
-        return audited_regions
-    return None
+        if region:
+            audited_regions.add(region)
+    return audited_regions
 
 
 def get_available_aws_service_regions(service: str, audit_info: AWS_Audit_Info) -> list:
diff --git a/tests/lib/check/check_test.py b/tests/lib/check/check_test.py
index 64a80379..d19f1d02 100644
--- a/tests/lib/check/check_test.py
+++ b/tests/lib/check/check_test.py
@@ -646,7 +646,7 @@ class Test_Check:
         recovered_checks = get_checks_from_input_arn(audit_resources, provider)
         assert recovered_checks == expected_checks
 
-    def test_get_regions_from_audit_resources(self):
+    def test_get_regions_from_audit_resources_with_regions(self):
         audit_resources = [
             f"arn:aws:lambda:us-east-1:{AWS_ACCOUNT_NUMBER}:function:test-lambda",
             f"arn:aws:iam::{AWS_ACCOUNT_NUMBER}:policy/test",
@@ -654,10 +654,15 @@ class Test_Check:
             "arn:aws:s3:::bucket-name",
             "arn:aws:apigateway:us-east-2::/restapis/api-id/stages/stage-name",
         ]
-        expected_regions = ["us-east-1", "eu-west-1", "us-east-2"]
+        expected_regions = {"us-east-1", "eu-west-1", "us-east-2"}
         recovered_regions = get_regions_from_audit_resources(audit_resources)
         assert recovered_regions == expected_regions
 
+    def test_get_regions_from_audit_resources_without_regions(self):
+        audit_resources = ["arn:aws:s3:::bucket-name"]
+        recovered_regions = get_regions_from_audit_resources(audit_resources)
+        assert not recovered_regions
+
     # def test_parse_checks_from_compliance_framework_two(self):
     #     test_case = {
     #         "input": {"compliance_frameworks": ["cis_v1.4_aws", "ens_v3_aws"]},