Index: sys/cddl/contrib/opensolaris/uts/common/sys/dtrace_impl.h
===================================================================
--- sys/cddl/contrib/opensolaris/uts/common/sys/dtrace_impl.h
+++ sys/cddl/contrib/opensolaris/uts/common/sys/dtrace_impl.h
@@ -1238,6 +1238,13 @@
 	processorid_t dta_beganon;		/* which CPU BEGIN ran on */
 } dtrace_anon_t;
 
+/*
+ * Define DEBUG if INVARIANTS are enabled.
+ */
+#ifdef INVARIANTS
+#define	DEBUG
+#endif
+
 /*
  * DTrace Error Debugging
  */