diff --git a/IPython/sphinxext/ipython_directive.py b/IPython/sphinxext/ipython_directive.py
index 0481624c42c..ad1a1272385 100644
--- a/IPython/sphinxext/ipython_directive.py
+++ b/IPython/sphinxext/ipython_directive.py
@@ -420,7 +420,7 @@ def process_image(self, decorator):
         # as absolute path for Sphinx
         # sphinx expects a posix path, even on Windows
         posix_path = pathlib.Path(savefig_dir,filename).as_posix()
-        outfile = '/' + os.path.relpath(posix_path, source_dir)
+        outfile = '/' + pathlib.Path(os.path.relpath(posix_path, source_dir)).as_posix()
 
         imagerows = ['.. image:: %s' % outfile]