diff --git a/drivers/char/mwave/mwavepub.h b/drivers/char/mwave/mwavepub.h
index f1f9da7..60c961ae 100644
--- a/drivers/char/mwave/mwavepub.h
+++ b/drivers/char/mwave/mwavepub.h
@@ -69,7 +69,7 @@
 typedef struct _MW_READWRITE {
 	unsigned short usDspAddress;	/* The dsp address */
 	unsigned long ulDataLength;	/* The size in bytes of the data or user buffer */
-	void *pBuf;		/* Input:variable sized buffer */
+	void __user *pBuf;		/* Input:variable sized buffer */
 } MW_READWRITE, *pMW_READWRITE;
 
 #define IOCTL_MW_RESET           _IO(MWAVE_MINOR,1)