diff --git a/sound/drivers/opl3/opl3_synth.c b/sound/drivers/opl3/opl3_synth.c
index 6d57b6441..301acb6 100644
--- a/sound/drivers/opl3/opl3_synth.c
+++ b/sound/drivers/opl3/opl3_synth.c
@@ -19,6 +19,7 @@
  *
  */
 
+#include <linux/slab.h>
 #include <sound/opl3.h>
 #include <sound/asound_fm.h>