diff --git a/src/hwapi.cpp b/src/hwapi.cpp
index e97d6ce..62fa681 100644
--- a/src/hwapi.cpp
+++ b/src/hwapi.cpp
@@ -56,11 +56,13 @@ hwapi::hwapi(QWidget *parent) : QObject(parent)
 
         myDatif = new T_datif();    // für die  CAslave-Lib auskommentieren!
 
-#else
+#endif
+
+#ifdef THIS_IS_CA_SLAVE
 
 #ifdef THIS_IS_CA_MASTER
 #error "MASTER LIB COMPILED INTO MASTER"
-#endif	
+#endif
 
 #endif