diff --git a/src/Serilog.Sinks.File/Sinks/File/FileSink.cs b/src/Serilog.Sinks.File/Sinks/File/FileSink.cs
index 610f9e7..443519a 100644
--- a/src/Serilog.Sinks.File/Sinks/File/FileSink.cs
+++ b/src/Serilog.Sinks.File/Sinks/File/FileSink.cs
@@ -93,7 +93,13 @@ public void Emit(LogEvent logEvent)
         }
 
         /// <inheritdoc />
-        public void Dispose() => _output.Dispose();
+        public void Dispose()
+        {
+            lock (_syncRoot)
+            {
+                _output.Dispose();
+            }
+        }
 
         /// <inheritdoc />
         public void FlushToDisk()
diff --git a/src/Serilog.Sinks.File/Sinks/File/SharedFileSink.cs b/src/Serilog.Sinks.File/Sinks/File/SharedFileSink.cs
index 113f608..bbb5142 100644
--- a/src/Serilog.Sinks.File/Sinks/File/SharedFileSink.cs
+++ b/src/Serilog.Sinks.File/Sinks/File/SharedFileSink.cs
@@ -146,7 +146,13 @@ public void Emit(LogEvent logEvent)
 
 
         /// <inheritdoc />
-        public void Dispose() => _fileOutput.Dispose();
+        public void Dispose()
+        {
+            lock (_syncRoot)
+            {
+                _fileOutput.Dispose();
+            }
+        }
 
         /// <inheritdoc />
         public void FlushToDisk()