diff --git a/src/IO/S3/copyS3File.cpp b/src/IO/S3/copyS3File.cpp
index b8b3cbbc54e..3d99a584933 100644
--- a/src/IO/S3/copyS3File.cpp
+++ b/src/IO/S3/copyS3File.cpp
@@ -239,11 +239,11 @@ namespace
                 // Multipart upload failed because it wasn't possible to schedule all the tasks.
                 // To avoid execution of already scheduled tasks we abort MultipartUpload.
                 abortMultipartUpload();
-                waitForAllBackGroundTasks();
+                waitForAllBackgroundTasks();
                 throw;
             }
 
-            waitForAllBackGroundTasks();
+            waitForAllBackgroundTasks();
             completeMultipartUpload();
         }
 
@@ -381,7 +381,7 @@ namespace
         virtual std::unique_ptr<Aws::AmazonWebServiceRequest> fillUploadPartRequest(size_t part_number, size_t part_offset, size_t part_size) = 0;
         virtual String processUploadPartRequest(Aws::AmazonWebServiceRequest & request) = 0;
 
-        void waitForAllBackGroundTasks()
+        void waitForAllBackgroundTasks()
         {
             if (!schedule)
                 return;
diff --git a/src/IO/WriteBufferFromS3.cpp b/src/IO/WriteBufferFromS3.cpp
index dde19c37e29..5a25cb89107 100644
--- a/src/IO/WriteBufferFromS3.cpp
+++ b/src/IO/WriteBufferFromS3.cpp
@@ -109,7 +109,7 @@ void WriteBufferFromS3::nextImpl()
     else
         processWithDynamicParts();
 
-    waitForReadyBackGroundTasks();
+    waitForReadyBackgroundTasks();
 }
 
 void WriteBufferFromS3::processWithStrictParts()
@@ -225,7 +225,7 @@ void WriteBufferFromS3::finalizeImpl()
     if (!is_prefinalized)
         preFinalize();
 
-    waitForAllBackGroundTasks();
+    waitForAllBackgroundTasks();
 
     if (!multipart_upload_id.empty())
         completeMultipartUpload();
@@ -632,7 +632,7 @@ void WriteBufferFromS3::processPutRequest(const PutObjectTask & task)
         max_retry, key, bucket);
 }
 
-void WriteBufferFromS3::waitForReadyBackGroundTasks()
+void WriteBufferFromS3::waitForReadyBackgroundTasks()
 {
     if (schedule)
     {
@@ -650,7 +650,7 @@ void WriteBufferFromS3::waitForReadyBackGroundTasks()
 
             if (exception)
             {
-                waitForAllBackGroundTasksUnlocked(lock);
+                waitForAllBackgroundTasksUnlocked(lock);
                 std::rethrow_exception(exception);
             }
 
@@ -659,16 +659,16 @@ void WriteBufferFromS3::waitForReadyBackGroundTasks()
     }
 }
 
-void WriteBufferFromS3::waitForAllBackGroundTasks()
+void WriteBufferFromS3::waitForAllBackgroundTasks()
 {
     if (schedule)
     {
         std::unique_lock lock(bg_tasks_mutex);
-        waitForAllBackGroundTasksUnlocked(lock);
+        waitForAllBackgroundTasksUnlocked(lock);
     }
 }
 
-void WriteBufferFromS3::waitForAllBackGroundTasksUnlocked(std::unique_lock<std::mutex> & bg_tasks_lock)
+void WriteBufferFromS3::waitForAllBackgroundTasksUnlocked(std::unique_lock<std::mutex> & bg_tasks_lock)
 {
     if (schedule)
     {
diff --git a/src/IO/WriteBufferFromS3.h b/src/IO/WriteBufferFromS3.h
index d3c7cdf2407..2374f1502f5 100644
--- a/src/IO/WriteBufferFromS3.h
+++ b/src/IO/WriteBufferFromS3.h
@@ -79,9 +79,9 @@ private:
     void fillPutRequest(S3::PutObjectRequest & req);
     void processPutRequest(const PutObjectTask & task);
 
-    void waitForReadyBackGroundTasks();
-    void waitForAllBackGroundTasks();
-    void waitForAllBackGroundTasksUnlocked(std::unique_lock<std::mutex> & bg_tasks_lock);
+    void waitForReadyBackgroundTasks();
+    void waitForAllBackgroundTasks();
+    void waitForAllBackgroundTasksUnlocked(std::unique_lock<std::mutex> & bg_tasks_lock);
 
     const String bucket;
     const String key;