diff --git a/xbob/learn/activation/version.cpp b/xbob/learn/activation/version.cpp
index 82b846b78d88a539299d1b5bb2478c880e5fe6cb..cc6e3dc19f236c53854402bce7a3a0bae6a8fdf7 100644
--- a/xbob/learn/activation/version.cpp
+++ b/xbob/learn/activation/version.cpp
@@ -21,6 +21,7 @@
 #endif
 #include <xbob.blitz/capi.h>
 #include <xbob.blitz/cleanup.h>
+#include <xbob.io/config.h>
 #include <xbob.learn.activation/config.h>
 
 static int dict_set(PyObject* d, const char* key, const char* value) {