diff --git a/lib/multi.c b/lib/multi.c
index 7ac984f7f7..0dd6994324 100644
--- a/lib/multi.c
+++ b/lib/multi.c
@@ -24,6 +24,11 @@
 #include "setup.h"
 #include <stdlib.h>
 #include <string.h>
+
+#ifdef HAVE_SYS_SOCKET_H
+#include <sys/socket.h>
+#endif
+
 #include <curl/curl.h>
 
 #include "urldata.h"
diff --git a/lib/ssluse.c b/lib/ssluse.c
index cb68ce5936..0983db3794 100644
--- a/lib/ssluse.c
+++ b/lib/ssluse.c
@@ -30,6 +30,9 @@
 
 #include <string.h>
 #include <stdlib.h>
+#ifdef HAVE_SYS_SOCKET_H
+#include <sys/socket.h>
+#endif
 
 #include "urldata.h"
 #include "sendf.h"