diff --git a/sys/opencrypto/criov.c b/sys/opencrypto/criov.c
index 02b040d787f..5312fe622c5 100644
--- a/sys/opencrypto/criov.c
+++ b/sys/opencrypto/criov.c
@@ -85,7 +85,7 @@ static void
 cuio_copydata(struct uio* uio, int off, int len, caddr_t cp)
 {
 	struct iovec *iov = uio->uio_iov;
-	int iol = uio->uio_iovcnt;
+	int iol __diagused = uio->uio_iovcnt;
 	unsigned count;
 
 	CUIO_SKIP();
@@ -105,7 +105,7 @@ static void
 cuio_copyback(struct uio* uio, int off, int len, c_caddr_t cp)
 {
 	struct iovec *iov = uio->uio_iov;
-	int iol = uio->uio_iovcnt;
+	int iol __diagused = uio->uio_iovcnt;
 	unsigned count;
 
 	CUIO_SKIP();
@@ -635,7 +635,7 @@ cuio_apply(struct uio *uio, int off, int len,
     int (*f)(void *, const void *, u_int), void *arg)
 {
 	struct iovec *iov = uio->uio_iov;
-	int iol = uio->uio_iovcnt;
+	int iol __diagused = uio->uio_iovcnt;
 	unsigned count;
 	int rval;