diff --git a/include/sound/hdsp.h b/include/sound/hdsp.h
index dec6b1dc37eab02c0c7ed2e498b08db1240b87fb..d98a78dff2db291e97c77fc16bde746d9f10f9f9 100644
--- a/include/sound/hdsp.h
+++ b/include/sound/hdsp.h
@@ -19,6 +19,8 @@
  *   Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  */
 
+#include <linux/types.h>
+
 #define HDSP_MATRIX_MIXER_SIZE 2048
 
 enum HDSP_IO_Type {