diff --git a/configure.in b/configure.in
index 58ece5b..fa37bda 100644
--- a/configure.in
+++ b/configure.in
@@ -982,7 +982,7 @@ AC_SUBST(OSSP_UUID_LIBS)
 ##
 
 dnl sys/socket.h is required by AC_FUNC_ACCEPT_ARGTYPES
-AC_CHECK_HEADERS([crypt.h dld.h fp_class.h getopt.h ieeefp.h ifaddrs.h langinfo.h poll.h pwd.h sys/ioctl.h sys/ipc.h sys/poll.h sys/pstat.h sys/resource.h sys/select.h sys/sem.h sys/shm.h sys/socket.h sys/sockio.h sys/tas.h sys/time.h sys/ucred.h sys/un.h termios.h ucred.h utime.h wchar.h wctype.h])
+AC_CHECK_HEADERS([crypt.h dld.h fp_class.h getopt.h ieeefp.h ifaddrs.h langinfo.h poll.h pwd.h sys/ioctl.h sys/ipc.h sys/param.h sys/poll.h sys/pstat.h sys/resource.h sys/select.h sys/sem.h sys/shm.h sys/socket.h sys/sockio.h sys/tas.h sys/time.h sys/un.h termios.h ucred.h utime.h wchar.h wctype.h])
 
 # On BSD, cpp test for net/if.h will fail unless sys/socket.h
 # is included first.
@@ -993,6 +993,14 @@ AC_CHECK_HEADERS(net/if.h, [], [],
 #endif
 ])
 
+# On OpenBSD including sys/ucred.h without sys/params.h will fail
+AC_CHECK_HEADERS(sys/ucred.h, [], [],
+[AC_INCLUDES_DEFAULT
+#ifdef HAVE_SYS_PARAM_H
+#include <sys/param.h>
+#endif
+])
+
 # At least on IRIX, cpp test for netinet/tcp.h will fail unless
 # netinet/in.h is included first.
 AC_CHECK_HEADERS(netinet/in.h)
@@ -1133,6 +1141,9 @@ PGAC_TYPE_LOCALE_T
 
 AC_CHECK_TYPES([struct cmsgcred], [], [],
 [#include <sys/socket.h>
+#ifdef HAVE_SYS_PARAM_H
+#include <sys/param.h>
+#endif
 #ifdef HAVE_SYS_UCRED_H
 #include <sys/ucred.h>
 #endif])