diff --git a/libc/include/netinet/icmp6.h b/libc/include/netinet/icmp6.h
index c5297e9..5a0293d 100644
--- a/libc/include/netinet/icmp6.h
+++ b/libc/include/netinet/icmp6.h
@@ -533,18 +533,28 @@
 	u_int32_t icmp6_filt[8];
 };
 
+/*
+ * BEGIN android-changed
+ * Linux and *BSD kernels use opposite values to indicate pass/block in ICMPv6
+ * filters, and assign a different value to the ICMP6_FILTER sockopt.
+ */
+#define ICMP6_FILTER 1
+
 #define	ICMP6_FILTER_SETPASSALL(filterp) \
-	(void)memset(filterp, 0xff, sizeof(struct icmp6_filter))
-#define	ICMP6_FILTER_SETBLOCKALL(filterp) \
 	(void)memset(filterp, 0x00, sizeof(struct icmp6_filter))
+#define	ICMP6_FILTER_SETBLOCKALL(filterp) \
+	(void)memset(filterp, 0xff, sizeof(struct icmp6_filter))
 #define	ICMP6_FILTER_SETPASS(type, filterp) \
-	(((filterp)->icmp6_filt[(type) >> 5]) |= (1 << ((type) & 31)))
-#define	ICMP6_FILTER_SETBLOCK(type, filterp) \
 	(((filterp)->icmp6_filt[(type) >> 5]) &= ~(1 << ((type) & 31)))
+#define	ICMP6_FILTER_SETBLOCK(type, filterp) \
+	(((filterp)->icmp6_filt[(type) >> 5]) |= (1 << ((type) & 31)))
 #define	ICMP6_FILTER_WILLPASS(type, filterp) \
-	((((filterp)->icmp6_filt[(type) >> 5]) & (1 << ((type) & 31))) != 0)
-#define	ICMP6_FILTER_WILLBLOCK(type, filterp) \
 	((((filterp)->icmp6_filt[(type) >> 5]) & (1 << ((type) & 31))) == 0)
+#define	ICMP6_FILTER_WILLBLOCK(type, filterp) \
+	((((filterp)->icmp6_filt[(type) >> 5]) & (1 << ((type) & 31))) != 0)
+/*
+ * END android-changed
+ */
 
 /*
  * Variables related to this implementation