diff --git a/llvm/include/llvm/CodeGen/GlobalISel/LegacyLegalizerInfo.h b/llvm/include/llvm/CodeGen/GlobalISel/LegacyLegalizerInfo.h
index 0b167ce9650d070..e423e48fd31ea35 100644
--- a/llvm/include/llvm/CodeGen/GlobalISel/LegacyLegalizerInfo.h
+++ b/llvm/include/llvm/CodeGen/GlobalISel/LegacyLegalizerInfo.h
@@ -19,6 +19,7 @@
 #include "llvm/CodeGen/LowLevelType.h"
 #include "llvm/CodeGen/TargetOpcodes.h"
 #include <unordered_map>
+#include <vector>
 
 namespace llvm {
 struct LegalityQuery;