diff --git a/libs/libc/misc/lib_err.c b/libs/libc/misc/lib_err.c
index 04195ef0b5..9ec3bda6ea 100644
--- a/libs/libc/misc/lib_err.c
+++ b/libs/libc/misc/lib_err.c
@@ -70,6 +70,10 @@ void vwarn(FAR const char *fmt, va_list ap)
 #else
   dprintf(STDERR_FILENO, "%d: %pV: %s\n", getpid(), &vaf, strerror(error));
 #endif
+
+#ifdef va_copy
+  va_end(copy);
+#endif
 }
 
 /****************************************************************************