diff --git a/gcc/ada/sem_prag.adb b/gcc/ada/sem_prag.adb
index 64b5b01869dab602e215f45197013e4d1d82d3a2..defa0d7879492fa170bf01ce20adfd671b5ac185 100644
--- a/gcc/ada/sem_prag.adb
+++ b/gcc/ada/sem_prag.adb
@@ -14791,7 +14791,7 @@ package body Sem_Prag is
             GNAT_Pragma;
             Check_Valid_Configuration_Pragma;
             Check_Arg_Count (1);
-            Check_Optional_Identifier (Arg1, "max_size");
+            Check_Optional_Identifier (Arg1, Name_Max_Size);
 
             Arg := Get_Pragma_Arg (Arg1);
             Check_Arg_Is_OK_Static_Expression (Arg, Any_Integer);