diff --git a/source/ec_test.cpp b/source/ec_test.cpp
index a0098ee..4a7ea6f 100644
--- a/source/ec_test.cpp
+++ b/source/ec_test.cpp
@@ -189,6 +189,12 @@ int main_loop()
         return -1;
     }
 
+    if (!(sc = ecrt_master_slave_config(
+                    master, DigOutSlavePos, Beckhoff_EL2008))) {
+        fprintf(stderr, "Failed to get slave configuration.\n");
+        return -1;
+    }
+
     if (ecrt_slave_config_pdos(sc, EC_END, el2008_syncs)) {
         fprintf(stderr, "Failed to configure PDOs.\n");
         return -1;