diff --git a/src/mdct.c b/src/mdct.c
index 58c7d78..10f0956 100644
--- a/src/mdct.c
+++ b/src/mdct.c
@@ -16,6 +16,7 @@
  *
  ******************************************************************************/
 
+#include "mdct.h"
 #include "tables.h"
 
 #include "mdct_neon.h"