diff --git a/llvm/include/llvm/Support/AMDHSAKernelDescriptor.h b/llvm/include/llvm/Support/AMDHSAKernelDescriptor.h
index 71519614f843d06893409edc0fe18d6b92bef8bc..bcaf7383044c30c94e5199e0f41d507f42674c4d 100644
--- a/llvm/include/llvm/Support/AMDHSAKernelDescriptor.h
+++ b/llvm/include/llvm/Support/AMDHSAKernelDescriptor.h
@@ -16,6 +16,7 @@
 #ifndef LLVM_SUPPORT_AMDHSAKERNELDESCRIPTOR_H
 #define LLVM_SUPPORT_AMDHSAKERNELDESCRIPTOR_H
 
+#include <cstddef>
 #include <cstdint>
 
 // Gets offset of specified member in specified type.