diff --git a/usage.c b/usage.c
index 8eab281..40b3de5 100644
--- a/usage.c
+++ b/usage.c
@@ -130,6 +130,7 @@
 	va_end(params);
 }
 
+#undef error
 int error(const char *err, ...)
 {
 	va_list params;