diff --git a/sound/pci/ctxfi/cttimer.c b/sound/pci/ctxfi/cttimer.c
index 3acb26d0c4cc..ceda74e356cb 100644
--- a/sound/pci/ctxfi/cttimer.c
+++ b/sound/pci/ctxfi/cttimer.c
@@ -7,6 +7,7 @@
  */
 
 #include <linux/slab.h>
+#include <linux/math64.h>
 #include <sound/core.h>
 #include <sound/pcm.h>
 #include "ctatc.h"