diff --git a/lib/libspl/page.c b/lib/libspl/page.c
index ad9aad998231..5b0d3f2e5786 100644
--- a/lib/libspl/page.c
+++ b/lib/libspl/page.c
@@ -1,34 +1,35 @@
 /*
  * CDDL HEADER START
  *
  * The contents of this file are subject to the terms of the
  * Common Development and Distribution License, Version 1.0 only
  * (the "License").  You may not use this file except in compliance
  * with the License.
  *
  * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
  * or http://www.opensolaris.org/os/licensing.
  * See the License for the specific language governing permissions
  * and limitations under the License.
  *
  * When distributing Covered Code, include this CDDL HEADER in each
  * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
  * If applicable, add the following below this CDDL HEADER, with the
  * fields enclosed by brackets "[]" replaced with your own identifying
  * information: Portions Copyright [yyyy] [name of copyright owner]
  *
  * CDDL HEADER END
  */
 
 #include <unistd.h>
+#include <sys/param.h>
 
 static size_t pagesize = 0;
 
 size_t
 spl_pagesize(void)
 {
 	if (pagesize == 0)
 		pagesize = sysconf(_SC_PAGESIZE);
 
 	return (pagesize);
 }