diff --git a/src/compat/internal.h b/src/compat/internal.h
index fd5e8af..43ff62d 100644
--- a/src/compat/internal.h
+++ b/src/compat/internal.h
@@ -43,6 +43,10 @@
 #  include <sys/param.h>
 #  ifdef BSD
 #   include <sys/types.h>
+typedef unsigned long u_long;
+typedef unsigned int u_int;
+typedef unsigned short u_short;
+typedef unsigned char u_char;
 #   include <sys/sysctl.h>
 #  endif
 # endif