diff --git a/include/types/activity.h b/include/types/activity.h
index 2a6f5bd..618785d 100644
--- a/include/types/activity.h
+++ b/include/types/activity.h
@@ -54,6 +54,12 @@
 	unsigned int accepted;     // accepted incoming connections
 	unsigned int accq_pushed;  // accept queue connections pushed
 	unsigned int accq_full;    // accept queue connection not pushed because full
+#if defined(DEBUG_DEV)
+	/* keep these ones at the end */
+	unsigned int ctr0;         // general purposee debug counter
+	unsigned int ctr1;         // general purposee debug counter
+	unsigned int ctr2;         // general purposee debug counter
+#endif
 	char __pad[0]; // unused except to check remaining room
 	char __end[0] __attribute__((aligned(64))); // align size to 64.
 };