diff --git a/soem/ethercatmain.h b/soem/ethercatmain.h
index 47a4a1d..5b2b312 100644
--- a/soem/ethercatmain.h
+++ b/soem/ethercatmain.h
@@ -38,7 +38,7 @@ extern "C"
 /** max. Adapter */
 #define EC_MAXLEN_ADAPTERNAME    128
 /** define maximum number of concurrent threads in mapping */
-#define EC_MAX_MAPT           8
+#define EC_MAX_MAPT           1
 
 typedef struct ec_adapter ec_adaptert;
 struct ec_adapter