diff --git a/cddl/contrib/opensolaris/cmd/zinject/zinject.c b/cddl/contrib/opensolaris/cmd/zinject/zinject.c
index 2302dc45317..cd48b685c6f 100644
--- a/cddl/contrib/opensolaris/cmd/zinject/zinject.c
+++ b/cddl/contrib/opensolaris/cmd/zinject/zinject.c
@@ -146,6 +146,7 @@
 #include <unistd.h>
 
 #include <sys/fs/zfs.h>
+#include <sys/param.h>
 #include <sys/mount.h>
 
 #include <libzfs.h>