diff --git a/error.c b/error.c
index c91745c..2ff2886 100644
--- a/error.c
+++ b/error.c
@@ -27,6 +27,7 @@
  * POSSIBILITY OF SUCH DAMAGE.
  */
 
+#include "config.h"
 #include "error.h"
 #include "handler.h"
 #include "util.h"