diff --git a/include/llvm/Support/AMDHSAKernelDescriptor.h b/include/llvm/Support/AMDHSAKernelDescriptor.h
index 71519614f84..bcaf7383044 100644
--- a/include/llvm/Support/AMDHSAKernelDescriptor.h
+++ b/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.