diff --git a/configure.ac b/configure.ac
index 3e672bc..d784a4d 100644
--- a/configure.ac
+++ b/configure.ac
@@ -39,6 +39,7 @@ if test "$BUILD_INTERNAL_LIBS" = "0"; then
    AC_SEARCH_LIBS(pcre_compile,pcre,,[MISSING_PCRE=1; MISSING_ANY=1])
 fi
 
+AC_TYPE_OFF_T
 AC_TYPE_UINT16_T
 AC_TYPE_UINT32_T
 AC_CHECK_FUNCS(random)