diff --git a/annif/openapi/validation.py b/annif/openapi/validation.py
index f28086050..2fce37732 100644
--- a/annif/openapi/validation.py
+++ b/annif/openapi/validation.py
@@ -15,20 +15,16 @@
 
 class CustomRequestBodyValidator(JSONRequestBodyValidator):
     """Custom request body validator that overrides the default error message for the
-    'maxItems' validator for the 'documents' property."""
+    'maxItems' validator for the 'documents' property to prevent logging request body
+    with the contents of all documents."""
 
     def __init__(self, *args, **kwargs) -> None:
         super().__init__(*args, **kwargs)
 
     def _validate(self, body: Any) -> dict | None:
-        if not self._nullable and body is None:
-            raise BadRequestProblem(
-                "Request body must not be empty"
-            )  # pragma: no cover
         try:
             return self._validator.validate(body)
         except ValidationError as exception:
-            # Prevent logging request body with contents of all documents
             if exception.validator == "maxItems" and list(exception.schema_path) == [
                 "properties",
                 "documents",
diff --git a/tests/test_openapi.py b/tests/test_openapi.py
index d7f347809..76f33695f 100644
--- a/tests/test_openapi.py
+++ b/tests/test_openapi.py
@@ -83,15 +83,6 @@ def test_openapi_suggest_novocab(app_client):
     assert req.status_code == 503
 
 
-def test_openapi_suggest_emptybody(app_client):
-    data = {}
-    req = app_client.post(
-        "http://localhost:8000/v1/projects/dummy-fi/suggest", data=data
-    )
-    assert req.status_code == 400
-    assert req.json()["detail"] == "RequestBody is required"
-
-
 def test_openapi_suggest_batch(app_client):
     data = {"documents": [{"text": "A quick brown fox jumped over the lazy dog."}] * 32}
     req = app_client.post(