diff --git a/moto/athena/models.py b/moto/athena/models.py
index bdba60cc0..a7d5e4a4b 100644
--- a/moto/athena/models.py
+++ b/moto/athena/models.py
@@ -86,7 +86,9 @@ class DataCatalog(TaggableResourceMixin, BaseModel):
 
 
 class Execution(BaseModel):
-    def __init__(self, query: str, context: str, config: str, workgroup: WorkGroup):
+    def __init__(
+        self, query: str, context: str, config: Dict[str, Any], workgroup: WorkGroup
+    ):
         self.id = str(mock_random.uuid4())
         self.query = query
         self.context = context
@@ -95,6 +97,11 @@ class Execution(BaseModel):
         self.start_time = time.time()
         self.status = "SUCCEEDED"
 
+        if "OutputLocation" in self.config:
+            if not self.config["OutputLocation"].endswith("/"):
+                self.config["OutputLocation"] += "/"
+            self.config["OutputLocation"] += f"{self.id}.csv"
+
 
 class QueryResults(BaseModel):
     def __init__(self, rows: List[Dict[str, Any]], column_info: List[Dict[str, str]]):
@@ -213,7 +220,7 @@ class AthenaBackend(BaseBackend):
         }
 
     def start_query_execution(
-        self, query: str, context: str, config: str, workgroup: WorkGroup
+        self, query: str, context: str, config: Dict[str, Any], workgroup: WorkGroup
     ) -> str:
         execution = Execution(
             query=query, context=context, config=config, workgroup=workgroup
diff --git a/tests/test_athena/test_athena.py b/tests/test_athena/test_athena.py
index 0ac70daf1..0b6dad04a 100644
--- a/tests/test_athena/test_athena.py
+++ b/tests/test_athena/test_athena.py
@@ -123,11 +123,13 @@ def test_start_query_validate_workgroup():
 
 
 @mock_aws
-def test_get_query_execution():
+@pytest.mark.parametrize(
+    "location", ["s3://bucket-name/prefix/", "s3://bucket-name/prefix_wo_slash"]
+)
+def test_get_query_execution(location):
     client = boto3.client("athena", region_name="us-east-1")
 
     query = "SELECT stuff"
-    location = "s3://bucket-name/prefix/"
     database = "database"
     # Start Query
     exex_id = client.start_query_execution(
@@ -141,7 +143,11 @@ def test_get_query_execution():
     assert details["QueryExecutionId"] == exex_id
     assert details["Query"] == query
     assert details["StatementType"] == "DML"
-    assert details["ResultConfiguration"]["OutputLocation"] == location
+    result_config = details["ResultConfiguration"]
+    if location.endswith("/"):
+        assert result_config["OutputLocation"] == f"{location}{exex_id}.csv"
+    else:
+        assert result_config["OutputLocation"] == f"{location}/{exex_id}.csv"
     assert details["QueryExecutionContext"]["Database"] == database
     assert details["Status"]["State"] == "SUCCEEDED"
     assert details["Statistics"] == {