diff --git a/lib/libzpool/include/sys/zfs_context.h b/lib/libzpool/include/sys/zfs_context.h
index 36159c42a3..1f1b52bbf2 100644
--- a/lib/libzpool/include/sys/zfs_context.h
+++ b/lib/libzpool/include/sys/zfs_context.h
@@ -104,7 +104,8 @@ extern void vpanic(const char *, __va_list);
 #define	fm_panic	panic
 
 /* This definition is copied from assert.h. */
-#if defined(__STDC__) && !defined(verify)
+#if !defined(verify)
+#if defined(__STDC__)
 #if __STDC_VERSION__ - 0 >= 199901L
 #define	verify(EX) (void)((EX) || \
 	(__assert_c99(#EX, __FILE__, __LINE__, __func__), 0))
@@ -114,6 +115,7 @@ extern void vpanic(const char *, __va_list);
 #else
 #define	verify(EX) (void)((EX) || (_assert("EX", __FILE__, __LINE__), 0))
 #endif	/* __STDC__ */
+#endif  /* !verify */
 
 
 #define	VERIFY	verify