diff --git a/projects/rocr-runtime/libhsakmt/include/hsakmt/linux/kfd_ioctl.h b/projects/rocr-runtime/libhsakmt/include/hsakmt/linux/kfd_ioctl.h
index d173e65c11..7f18e57c5b 100644
--- a/projects/rocr-runtime/libhsakmt/include/hsakmt/linux/kfd_ioctl.h
+++ b/projects/rocr-runtime/libhsakmt/include/hsakmt/linux/kfd_ioctl.h
@@ -1853,5 +1853,9 @@ struct kfd_ioctl_create_process_args {
 
 #define AMDKFD_COMMAND_START_2		0x80
 #define AMDKFD_COMMAND_END_2		0x88
+#ifndef _IOC_SIZEMASK
+#define _IOC_SIZEMASK ((1 << _IOC_SIZEBITS) - 1)
+#endif
+#define AMDKFD_MAX_IOCTL_SIZE _IOC_SIZEMASK
 
 #endif