diff --git a/compat.h b/compat.h
index 582348a4..8110e294 100644
--- a/compat.h
+++ b/compat.h
@@ -71,7 +71,7 @@ static inline int setpriority(__maybe_unused int which, __maybe_unused int who,
 }
 
 #ifndef HAVE_STRSEP
-inline char *strsep(char **stringp, const char *delim)
+static inline char *strsep(char **stringp, const char *delim)
 {
   char *res;