diff --git a/CMakeLists.txt b/CMakeLists.txt
index 4c84456ef011..a9612b017391 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -336,8 +336,7 @@ if("${ENABLE_ALL_WARNINGS}")
          -Wno-strict-aliasing \
          -Wno-type-limits \
          -Wno-stringop-overflow \
-         -Wno-stringop-overread \
-         -Wno-return-type")
+         -Wno-stringop-overread")
   endif()
 
   set(KNOWN_WARNINGS
diff --git a/velox/connectors/hive/HivePartitionFunction.cpp b/velox/connectors/hive/HivePartitionFunction.cpp
index 9b8887c3f60f..ad787455abc6 100644
--- a/velox/connectors/hive/HivePartitionFunction.cpp
+++ b/velox/connectors/hive/HivePartitionFunction.cpp
@@ -51,6 +51,7 @@ inline uint32_t hashOne(
   VELOX_UNSUPPORTED(
       "Hive partitioning function doesn't support {} type",
       TypeTraits<kind>::name);
+  return 0; // Make compiler happy.
 }
 
 template <>
diff --git a/velox/connectors/hive/storage_adapters/abfs/AbfsWriteFile.cpp b/velox/connectors/hive/storage_adapters/abfs/AbfsWriteFile.cpp
index c231954258f5..1e390ea729e4 100644
--- a/velox/connectors/hive/storage_adapters/abfs/AbfsWriteFile.cpp
+++ b/velox/connectors/hive/storage_adapters/abfs/AbfsWriteFile.cpp
@@ -118,11 +118,10 @@ class AbfsWriteFile::Impl {
       blobStorageFileClient_->getProperties();
       return true;
     } catch (Azure::Storage::StorageException& e) {
-      if (e.StatusCode == Azure::Core::Http::HttpStatusCode::NotFound) {
-        return false;
-      } else {
+      if (e.StatusCode != Azure::Core::Http::HttpStatusCode::NotFound) {
         throwStorageExceptionWithOperationDetails("GetProperties", path_, e);
       }
+      return false;
     }
   }
 
diff --git a/velox/exec/tests/TableWriteTest.cpp b/velox/exec/tests/TableWriteTest.cpp
index ee114a1ec01b..23fc416e08ab 100644
--- a/velox/exec/tests/TableWriteTest.cpp
+++ b/velox/exec/tests/TableWriteTest.cpp
@@ -64,6 +64,7 @@ std::string testModeString(TestMode mode) {
     case TestMode::kBucketed:
       return "BUCKETED";
   }
+  VELOX_UNREACHABLE();
 }
 
 static std::shared_ptr<core::AggregationNode> generateAggregationNode(
diff --git a/velox/functions/prestosql/types/JsonType.cpp b/velox/functions/prestosql/types/JsonType.cpp
index 7b11b8f9eaa1..4f90f5200866 100644
--- a/velox/functions/prestosql/types/JsonType.cpp
+++ b/velox/functions/prestosql/types/JsonType.cpp
@@ -643,6 +643,7 @@ struct CastFromJsonTypedImpl {
     static simdjson::error_code apply(Input, exec::GenericWriter&) {
       VELOX_NYI(
           "Casting from JSON to {} is not supported.", TypeTraits<kind>::name);
+      return simdjson::error_code::UNEXPECTED_ERROR; // Make compiler happy.
     }
   };
 
diff --git a/velox/functions/remote/if/GetSerde.cpp b/velox/functions/remote/if/GetSerde.cpp
index 84e5108ad8cf..78f52d614796 100644
--- a/velox/functions/remote/if/GetSerde.cpp
+++ b/velox/functions/remote/if/GetSerde.cpp
@@ -28,6 +28,6 @@ std::unique_ptr<VectorSerde> getSerde(const remote::PageFormat& format) {
     case remote::PageFormat::SPARK_UNSAFE_ROW:
       return std::make_unique<serializer::spark::UnsafeRowVectorSerde>();
   }
+  VELOX_UNREACHABLE();
 }
-
 } // namespace facebook::velox::functions