diff --git a/m4/acx_check_strptr_convert.m4 b/m4/acx_check_strptr_convert.m4
index 6c78deea5d58ebc3df191004b54f60c02dfdbc88..de409d92e910d984fdbd2bf07ffecfd1284ec73a 100644
--- a/m4/acx_check_strptr_convert.m4
+++ b/m4/acx_check_strptr_convert.m4
@@ -91,6 +91,7 @@ end program conftest])],
 m4_ifval([$1],[$1])],
      [AC_MSG_RESULT([no])
 m4_ifval([$2],[$2])])
+   rm -f conftest_mod* CONFTEST_MOD*
    AC_LANG_POP([Fortran])])
 
 dnl