diff --git a/src/util/util.c b/src/util/util.c
index ce98d206d6..f886ea7007 100644
--- a/src/util/util.c
+++ b/src/util/util.c
@@ -65,6 +65,9 @@
 #endif
 
 #ifdef WIN32
+# ifdef HAVE_WINSOCK2_H
+#  include <winsock2.h>
+# endif
 # include <windows.h>
 # include <shlobj.h>
 #endif
diff --git a/src/vbox/vbox_MSCOMGlue.c b/src/vbox/vbox_MSCOMGlue.c
index b07d6a7ed8..68810fbf77 100644
--- a/src/vbox/vbox_MSCOMGlue.c
+++ b/src/vbox/vbox_MSCOMGlue.c
@@ -22,6 +22,9 @@
 
 #include <config.h>
 
+#ifdef HAVE_WINSOCK2_H
+# include <winsock2.h>
+#endif
 #include <windows.h>
 
 #define nsCID CLSID