diff --git a/llvm/include/llvm/MC/LaneBitmask.h b/llvm/include/llvm/MC/LaneBitmask.h
index a467407f1706404192a3e650517e6158c3621956..efc81dce92364bd13f0a9188938f33df2e108326 100644
--- a/llvm/include/llvm/MC/LaneBitmask.h
+++ b/llvm/include/llvm/MC/LaneBitmask.h
@@ -31,6 +31,7 @@
 
 #include "llvm/Support/Compiler.h"
 #include "llvm/Support/Format.h"
+#include "llvm/Support/MathExtras.h"
 #include "llvm/Support/Printable.h"
 #include "llvm/Support/raw_ostream.h"