diff --git a/configure.ac b/configure.ac
index 3a1f19a..875ff04 100644
--- a/configure.ac
+++ b/configure.ac
@@ -241,6 +241,7 @@ const char *p = program_invocation_short_name;
 AC_MSG_CHECKING([for __progname])
 AC_LINK_IFELSE([
   AC_LANG_PROGRAM([[
+#include <stdio.h>
 extern char *__progname;
   ]], [[
 printf("%s", __progname);