diff --git a/openair3/RAL-LTE/INTERFACE-802.21/INCLUDE/MIH_C_Types.h b/openair3/RAL-LTE/INTERFACE-802.21/INCLUDE/MIH_C_Types.h
index 8766eea66c..797983a245 100755
--- a/openair3/RAL-LTE/INTERFACE-802.21/INCLUDE/MIH_C_Types.h
+++ b/openair3/RAL-LTE/INTERFACE-802.21/INCLUDE/MIH_C_Types.h
@@ -21,6 +21,7 @@ Type definition and structure for 802.21 interface
 #include <sys/types.h>
 #include <linux/types.h>
 #warning " Hack USER_MODE"
+#undef USER_MODE
 #define USER_MODE
 
 //-----------------------------------------------------------------------------