diff --git a/src/main/c/configure.ac b/src/main/c/configure.ac
index f2075a4..8e6a85a 100644
--- a/src/main/c/configure.ac
+++ b/src/main/c/configure.ac
@@ -1,6 +1,6 @@
 AC_PREREQ([2.61])
 AC_INIT([libusb4java], [1.0.0], [k@ailis.de])
-AM_INIT_AUTOMAKE([foreign -Wall -Werror])
+AM_INIT_AUTOMAKE([foreign -Wall -Wno-extra-portability -Werror])
 AC_CONFIG_MACRO_DIR([m4])
 AC_CONFIG_HEADERS([config.h])
 AC_CONFIG_SRCDIR([src/usb4java.h])