diff --git a/sys/cam/mmc/mmc_sim.h b/sys/cam/mmc/mmc_sim.h
index 10bd183c307d..18c49b3f57e8 100644
--- a/sys/cam/mmc/mmc_sim.h
+++ b/sys/cam/mmc/mmc_sim.h
@@ -1,48 +1,48 @@
 /*-
  * Copyright (c) 2020 Emmanuel Vadot <manu@FreeBSD.org>
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
  * are met:
  * 1. Redistributions of source code must retain the above copyright
  *    notice, this list of conditions and the following disclaimer.
  * 2. Redistributions in binary form must reproduce the above copyright
  *    notice, this list of conditions and the following disclaimer in the
  *    documentation and/or other materials provided with the distribution.
  *
  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
  * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
  * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
  * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
  * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
  * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  * SUCH DAMAGE.
  *
  * $FreeBSD$
  */
 
 #ifndef __MMC_SIM_H__
 #define	__MMC_SIM_H__
 
 #include <sys/taskqueue.h>
 
 struct mmc_sim {
 	struct mmc_cam_sim_softc	*sc;
 	struct mtx			mtx;
-	char				name[64];
+	char				name[16];
 	struct cam_devq			*devq;
 	struct cam_sim			*sim;
 	device_t			dev;
 	struct task			sim_task;
 	union ccb			*ccb;
 };
 
 int mmc_cam_sim_alloc(device_t dev, const char *name, struct mmc_sim *mmc_sim);
 void mmc_cam_sim_free(struct mmc_sim *sim);
 void mmc_cam_sim_discover(struct mmc_sim *mmc_sim);
 
 #endif	/* __MMC_SIM_H__ */