diff --git a/slsReceiverSoftware/src/DataProcessor.h b/slsReceiverSoftware/src/DataProcessor.h
index 71e719369..c9eacbac0 100644
--- a/slsReceiverSoftware/src/DataProcessor.h
+++ b/slsReceiverSoftware/src/DataProcessor.h
@@ -16,7 +16,7 @@ class GeneralData;
 class Fifo;
 class File;
 class DataStreamer;
-class MasterAttributes;
+struct MasterAttributes;
 
 #include <atomic>
 #include <vector>
diff --git a/slsReceiverSoftware/src/File.h b/slsReceiverSoftware/src/File.h
index 651691df5..20a6c4562 100644
--- a/slsReceiverSoftware/src/File.h
+++ b/slsReceiverSoftware/src/File.h
@@ -15,7 +15,7 @@
 
 #include <string>
 
-class MasterAttributes;
+struct MasterAttributes;
 
 class File : private virtual slsDetectorDefs {