diff --git a/configure.ac b/configure.ac
index 91297b8c03d9e974d4f6e6c0c65a6cf56ae41691..bc29606af71498b26fda47188fd37ec589ac2513 100644
--- a/configure.ac
+++ b/configure.ac
@@ -13,6 +13,7 @@ AC_DISABLE_SHARED
 
 # check if we're in the right directory
 AC_CONFIG_SRCDIR([src/serial/gitter_sti.h])
+AC_CONFIG_MACRO_DIR([m4])
 # which header-file is created
 AM_CONFIG_HEADER(config.h)