diff --git a/commands/bc/proto.h b/commands/bc/proto.h
index 3e04ebc60..a036cb548 100755
--- a/commands/bc/proto.h
+++ b/commands/bc/proto.h
@@ -161,5 +161,5 @@ _PROTOTYPE(int yyparse, (void));
 _PROTOTYPE(int yylex, (void)); 
 
 /* Other things... */
-_PROTOTYPE(int getopt, (int, char * const [], const char * ));
+_PROTOTYPE(int getopt, (int, char * [], char * ));