diff --git a/gnu/usr.bin/bc/proto.h b/gnu/usr.bin/bc/proto.h
index dd3782d602d8..37fb212a86e2 100644
--- a/gnu/usr.bin/bc/proto.h
+++ b/gnu/usr.bin/bc/proto.h
@@ -156,5 +156,5 @@ _PROTOTYPE(int yyparse, (void));
 _PROTOTYPE(int yylex, (void));
 
 /* Other things... */
-_PROTOTYPE (int getopt, (int, char *[], CONST char *));
+_PROTOTYPE (int getopt, (int, char * CONST [], CONST char *));