diff --git a/lib/libzpool/kernel.c b/lib/libzpool/kernel.c
index a3930ee07f73..7e45e76b6bc5 100644
--- a/lib/libzpool/kernel.c
+++ b/lib/libzpool/kernel.c
@@ -133,7 +133,9 @@ zk_thread_create(const char *name, void (*func)(void *), void *arg,
 	 * multiple of system page size.
 	 */
 	VERIFY0(pthread_attr_setstacksize(&attr, stksize));
+#ifndef __CHERI_PURE_CAPABILITY__
 	VERIFY0(pthread_attr_setguardsize(&attr, PAGESIZE));
+#endif
 
 	VERIFY(ztw = malloc(sizeof (*ztw)));
 	ztw->func = func;