diff --git a/src/afs/SOLARIS/osi_vnodeops.c b/src/afs/SOLARIS/osi_vnodeops.c
index e6e9623383..69b4d421e5 100644
--- a/src/afs/SOLARIS/osi_vnodeops.c
+++ b/src/afs/SOLARIS/osi_vnodeops.c
@@ -46,6 +46,7 @@
 #include <vm/seg_vn.h>
 #include <vm/rm.h>
 #if defined(AFS_SUN511_ENV)
+#include <sys/vmsystm.h>
 #include <sys/vfs_opreg.h>
 #endif
 #include <sys/modctl.h>