diff --git a/src/main/java/net/schmizz/sshj/sftp/PathHelper.java b/src/main/java/net/schmizz/sshj/sftp/PathHelper.java
index 0691c669..07686f90 100644
--- a/src/main/java/net/schmizz/sshj/sftp/PathHelper.java
+++ b/src/main/java/net/schmizz/sshj/sftp/PathHelper.java
@@ -49,7 +49,7 @@ public class PathHelper {
         }
     }
 
-    private String getDotDir()
+    private synchronized String getDotDir()
             throws IOException {
         return (dotDir != null) ? dotDir : (dotDir = canon("."));
     }