diff --git a/hash.c b/hash.c
index b4ce6acbf9..b8e94cbcf6 100644
--- a/hash.c
+++ b/hash.c
@@ -2408,7 +2408,7 @@ static char **my_environ;
 #undef environ
 #define environ my_environ
 #undef getenv
-inline char *
+static inline char *
 w32_getenv(const char *name)
 {
     static int binary = -1;