diff --git a/include/FLAC/all.h b/include/FLAC/all.h
index 154b8e68..fcdf863d 100644
--- a/include/FLAC/all.h
+++ b/include/FLAC/all.h
@@ -20,6 +20,7 @@
 #ifndef FLAC__ALL_H
 #define FLAC__ALL_H
 
+#include "config.h"
 #include "encoder.h"
 #include "file_decoder.h"
 #include "format.h"