diff --git a/include/llvm/ADT/ImmutableSet.h b/include/llvm/ADT/ImmutableSet.h
index 949dc44daba..84c7bead646 100644
--- a/include/llvm/ADT/ImmutableSet.h
+++ b/include/llvm/ADT/ImmutableSet.h
@@ -22,7 +22,6 @@
 #include <cassert>
 #include <functional>
 #include <vector>
-#include <stdio.h>
 
 namespace llvm {