diff --git a/polly/docs/Architecture.rst b/polly/docs/Architecture.rst
index c0745c19d373..136b2501288d 100644
--- a/polly/docs/Architecture.rst
+++ b/polly/docs/Architecture.rst
@@ -11,3 +11,4 @@ optimizations have been derived and applied, optimized LLVM-IR is regenerated
 and inserted into the LLVM-IR module.
 
 .. image:: images/architecture.png
+    :align: center