diff --git a/llvm/utils/PerfectShuffle/PerfectShuffle.cpp b/llvm/utils/PerfectShuffle/PerfectShuffle.cpp
index b19dd0d39ace..386b05d43ce5 100644
--- a/llvm/utils/PerfectShuffle/PerfectShuffle.cpp
+++ b/llvm/utils/PerfectShuffle/PerfectShuffle.cpp
@@ -16,6 +16,7 @@
 
 #include <iostream>
 #include <vector>
+#include <cassert>
 
 struct Operator;