diff --git a/include/export/lib/utils_def_exp.h b/include/export/lib/utils_def_exp.h
index 86c409c..d4a4a85 100644
--- a/include/export/lib/utils_def_exp.h
+++ b/include/export/lib/utils_def_exp.h
@@ -25,11 +25,13 @@
 # define   L(_x)	(_x)
 # define  LL(_x)	(_x)
 #else
-# define   U(_x)	(_x##U)
+# define  U_(_x)	(_x##U)
+# define   U(_x)	U_(_x)
 # define  UL(_x)	(_x##UL)
 # define ULL(_x)	(_x##ULL)
 # define   L(_x)	(_x##L)
 # define  LL(_x)	(_x##LL)
+
 #endif
 
 #endif /* ARM_TRUSTED_FIRMWARE_EXPORT_LIB_UTILS_DEF_EXP_H */