diff --git a/utils/Burg/main.c b/utils/Burg/main.c
index dbfdbf4faca..01d77d2a4b4 100644
--- a/utils/Burg/main.c
+++ b/utils/Burg/main.c
@@ -21,7 +21,7 @@ int
 main(argc, argv) int argc; char **argv;
 {
 	int i;
-	extern int atoi ARGS((char *));
+	extern int atoi ARGS((const char *));
 
 	for (i = 1; argv[i]; i++) {
 		char **needStr = 0;