Protoized old pre-ANSI K&R style declarations and definitions

1 files changed, 1 insertions, 1 deletions

diff --git a/hash.c b/hash.c
index ce0e72a017..9b98739c97 100644
--- a/hash.c
+++ b/hash.c
@@ -4820,7 +4820,7 @@ extern char **environ;
 #endif
 
 static inline rb_encoding *
-env_encoding()
+env_encoding(void)
 {
 #ifdef _WIN32
     return rb_utf8_encoding();