diff --git a/cf/dlopen.m4 b/cf/dlopen.m4
index b02edf257..17e3c6203 100644
--- a/cf/dlopen.m4
+++ b/cf/dlopen.m4
@@ -3,6 +3,9 @@ dnl $Id$
 dnl
 
 AC_DEFUN([rk_DLOPEN], [
-	AC_FIND_FUNC_NO_LIBS(dlopen, dl)
+	AC_FIND_FUNC_NO_LIBS(dlopen, dl,[
+#ifdef HAVE_DLFCN_H
+#include <dlfcn.h>
+#endif],[0,0])
 	AM_CONDITIONAL(HAVE_DLOPEN, test "$ac_cv_funclib_dlopen" != no)
 ])