diff --git a/lib/libspl/include/limits.h b/lib/libspl/include/limits.h
index 1a42cfec469c..5d996eb846d1 100644
--- a/lib/libspl/include/limits.h
+++ b/lib/libspl/include/limits.h
@@ -1,40 +1,45 @@
 /*
  * 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
  */
 /*
  * Copyright 2008 Sun Microsystems, Inc.  All rights reserved.
  * Use is subject to license terms.
  */
 
 #include_next <limits.h>
+#include <float.h>
 
 #ifndef _LIBSPL_LIMITS_H
 #define	_LIBSPL_LIMITS_H
 
+#ifndef DBL_DIG
 #define	DBL_DIG		15
 #define	DBL_MAX		1.7976931348623157081452E+308
 #define	DBL_MIN		2.2250738585072013830903E-308
+#endif
 
+#ifndef FLT_DIG
 #define	FLT_DIG		6
 #define	FLT_MAX		3.4028234663852885981170E+38F
 #define	FLT_MIN		1.1754943508222875079688E-38F
+#endif
 
 #endif /* _LIBSPL_LIMITS_H */