Use prototype definition instead of old K&R style

1 files changed, 1 insertions, 1 deletions

diff --git a/hash.c b/hash.c
index f8c5249837..32a258e733 100644
--- a/hash.c
+++ b/hash.c
@@ -5369,7 +5369,7 @@ env_aset(VALUE nm, VALUE val)
 }
 
 static int
-env_entry_count()
+env_entry_count(void)
 {
     int i;
     char **env;