diff --git a/backend/app/api/deps.py b/backend/app/api/deps.py
index 8426bee..72190f2 100644
--- a/backend/app/api/deps.py
+++ b/backend/app/api/deps.py
@@ -75,7 +75,7 @@ def _fetch_tenant_from_backend(token: str) -> TenantContext:
     try:
         response = httpx.get(
             f"{settings.KAAPI_AUTH_URL}/apikeys/verify",
-            headers={"X-API-KEY": f"ApiKey {token}"},
+            headers={"X-API-KEY": token},
             timeout=settings.KAAPI_AUTH_TIMEOUT,
         )
     except httpx.RequestError:
diff --git a/backend/app/tests/test_deps_multitenant.py b/backend/app/tests/test_deps_multitenant.py
index 2c76880..0f60d59 100644
--- a/backend/app/tests/test_deps_multitenant.py
+++ b/backend/app/tests/test_deps_multitenant.py
@@ -37,7 +37,7 @@ def fake_get(url, headers, timeout):
 
     monkeypatch.setattr(httpx, "get", fake_get)
 
-    context = validate_multitenant_key("abc123")
+    context = validate_multitenant_key("ApiKey abc123")
 
     assert isinstance(context, TenantContext)
     assert (context.organization_id, context.project_id) == (10, 20)
@@ -133,7 +133,7 @@ def fake_get(url, headers, timeout):
 
     monkeypatch.setattr(httpx, "get", fake_get)
 
-    context = validate_multitenant_key("No3x47A5")
+    context = validate_multitenant_key("ApiKey No3x47A5")
 
     assert isinstance(context, TenantContext)
     assert context.organization_id == 1