diff --git a/sys/netinet/sctp_constants.h b/sys/netinet/sctp_constants.h
index 7a2b3a995719..f042531a7126 100644
--- a/sys/netinet/sctp_constants.h
+++ b/sys/netinet/sctp_constants.h
@@ -992,7 +992,7 @@ do { \
 #define sctp_sowwakeup_locked(inp, so) \
 do { \
 	if (inp->sctp_flags & SCTP_PCB_FLAGS_DONT_WAKE) { \
-                SOCKBUF_UNLOCK(&((so)->so_snd)); \
+		SOCKBUF_UNLOCK(&((so)->so_snd)); \
 		inp->sctp_flags |= SCTP_PCB_FLAGS_WAKEOUTPUT; \
 	} else { \
 		sowwakeup_locked(so); \