diff --git a/platforms/posix/include/windows_shim/syslog.h b/platforms/posix/include/windows_shim/syslog.h
index 885b1b45af..18705b9c0d 100644
--- a/platforms/posix/include/windows_shim/syslog.h
+++ b/platforms/posix/include/windows_shim/syslog.h
@@ -100,7 +100,7 @@ static inline void openlog(const char *ident, int option, int facility)
 }
 
 /** @brief Close the syslog sink; no-op for the stderr-backed shim. */
-static inline void closelog(void) {}
+static inline void closelog() {}
 
 /**
  * @brief Set the active syslog priority mask.