diff --git a/include/haproxy/defaults.h b/include/haproxy/defaults.h
index 54e733d12..cc4d47683 100644
--- a/include/haproxy/defaults.h
+++ b/include/haproxy/defaults.h
@@ -34,6 +34,7 @@
 
 #define MAX_TGROUPS 1
 #define MAX_THREADS_PER_GROUP 1
+#define DEF_MAX_THREADS_PER_GROUP 1
 
 #else