diff --git a/src/bro_inet_ntop.h b/src/bro_inet_ntop.h
index 00326b092e..c018403893 100644
--- a/src/bro_inet_ntop.h
+++ b/src/bro_inet_ntop.h
@@ -5,6 +5,7 @@
 extern "C" {
 #endif
 
+#include <sys/types.h>
 #include <sys/socket.h>
 
 const char * 
diff --git a/src/threading/SerialTypes.h b/src/threading/SerialTypes.h
index 60aee2411e..f4f0bc0957 100644
--- a/src/threading/SerialTypes.h
+++ b/src/threading/SerialTypes.h
@@ -2,6 +2,7 @@
 #ifndef THREADING_SERIALIZATIONTYPES_H
 #define THREADING_SERIALIZATIONTYPES_H
 
+#include <sys/types.h>
 #include <sys/socket.h>
 #include <netinet/in.h>
 #include <arpa/inet.h>