diff --git a/lib/libzpool/include/sys/zfs_context.h b/lib/libzpool/include/sys/zfs_context.h
index a0c924573f..f6778d2442 100644
--- a/lib/libzpool/include/sys/zfs_context.h
+++ b/lib/libzpool/include/sys/zfs_context.h
@@ -121,6 +121,11 @@ extern void vpanic(const char *, __va_list);
  * existence for their counterparts in libzpool.
  */
 
+#ifdef DTRACE_PROBE
+#undef	DTRACE_PROBE
+#define	DTRACE_PROBE(a)	((void)0)
+#endif	/* DTRACE_PROBE */
+
 #ifdef DTRACE_PROBE1
 #undef	DTRACE_PROBE1
 #define	DTRACE_PROBE1(a, b, c)	((void)0)
@@ -406,6 +411,8 @@ extern void delay(clock_t ticks);
 #define	kcred		NULL
 #define	CRED()		NULL
 
+#define	ptob(x)		((x) * PAGESIZE)
+
 extern uint64_t physmem;
 
 extern int highbit(ulong_t i);