Merge branch 'master' of github.com:sctplab/usrsctp
diff --git a/usrsctplib/netinet/sctp_pcb.c b/usrsctplib/netinet/sctp_pcb.c
index a26d893..4dceec5 100755
--- a/usrsctplib/netinet/sctp_pcb.c
+++ b/usrsctplib/netinet/sctp_pcb.c
@@ -73,6 +73,7 @@
 #endif
 #if defined(__Userspace__)
 #include <user_socketvar.h>
+#include <user_atomic.h>
 #if !defined(__Userspace_os_Windows)
 #include <netdb.h>
 #endif