diff --git a/tuf/repository_tool.py b/tuf/repository_tool.py
index 229559ec..ec90046c 100755
--- a/tuf/repository_tool.py
+++ b/tuf/repository_tool.py
@@ -104,7 +104,7 @@
 
 except tuf.UnsupportedLibraryError as e: #pragma: no cover
   message = 'Warning: The repository and developer tools require additional' + \
-    ' libraries, which that can be installed as follows:\n $ pip install tuf[tools]'  
+    ' libraries, which can be installed as follows:\n $ pip install tuf[tools]'  
   logger.warn(message)