1 files changed, 2 insertions, 0 deletions
diff --git a/lib/if2ip.h b/lib/if2ip.h
index 4364b09d1..4e86e2b27 100644
--- a/lib/if2ip.h
+++ b/lib/if2ip.h
@@ -27,6 +27,8 @@
 extern char *Curl_if2ip(const char *interf, char *buf, int buf_size);
 
 #ifdef __INTERIX
+#include <sys/socket.h>
+
 /* Nedelcho Stanev's work-around for SFU 3.0 */
 struct ifreq {
 #define IFNAMSIZ 16