diff --git a/libkms/vmwgfx.c b/libkms/vmwgfx.c
index f0e40be7..1984399c 100644
--- a/libkms/vmwgfx.c
+++ b/libkms/vmwgfx.c
@@ -25,6 +25,9 @@
  *
  **************************************************************************/
 
+#ifdef __FreeBSD__
+#define _WANT_KERNEL_ERRNO
+#endif
 
 #include <errno.h>
 #include <stdlib.h>