diff --git a/include/hip/hip_runtime_api.h b/include/hip/hip_runtime_api.h
index 80bfd2891f..ef078aba9b 100644
--- a/include/hip/hip_runtime_api.h
+++ b/include/hip/hip_runtime_api.h
@@ -662,6 +662,9 @@ enum hipLimit_t {
 /** Not supported.*/
 #define hipHostRegisterIoMemory 0x4
 
+/** This flag is ignored On AMD devices.*/
+#define hipHostRegisterReadOnly 0x08
+
 /** Coarse Grained host memory lock.*/
 #define hipExtHostRegisterCoarseGrained 0x8