diff --git a/dlls/iphlpapi/ifenum.c b/dlls/iphlpapi/ifenum.c
index 8e7e9292c94..8a9135b27a1 100644
--- a/dlls/iphlpapi/ifenum.c
+++ b/dlls/iphlpapi/ifenum.c
@@ -39,6 +39,9 @@
 #endif
 
 #include <sys/types.h>
+#ifdef HAVE_SYS_PARAM_H
+#include <sys/param.h>
+#endif
 
 #ifdef HAVE_SYS_SOCKET_H
 #include <sys/socket.h>