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-rw-r--r--inet/netinet/in.h2
1 files changed, 1 insertions, 1 deletions
diff --git a/inet/netinet/in.h b/inet/netinet/in.h
index ddc09753e2..418c6f96f7 100644
--- a/inet/netinet/in.h
+++ b/inet/netinet/in.h
@@ -118,7 +118,7 @@ struct in_addr
 #define	IN_CLASSB_HOST		(0xffffffff & ~IN_CLASSB_NET)
 #define	IN_CLASSB_MAX		65536
 
-#define	IN_CLASSC(a)		((((uint32_t) (a)) & 0xc0000000) == 0xc0000000)
+#define	IN_CLASSC(a)		((((uint32_t) (a)) & 0xe0000000) == 0xc0000000)
 #define	IN_CLASSC_NET		0xffffff00
 #define	IN_CLASSC_NSHIFT	8
 #define	IN_CLASSC_HOST		(0xffffffff & ~IN_CLASSC_NET)