diff --git a/src/datIf.cpp b/src/datIf.cpp
index 5658fde..8311987 100644
--- a/src/datIf.cpp
+++ b/src/datIf.cpp
@@ -14,6 +14,7 @@ History:
 #include <QDir>
 
 
+#include <algorithm> // min/max
 
 
 
@@ -1048,7 +1049,7 @@ char T_datif::loadRecDataFromFrame()
                 // only use as many bytes as maximally possible
                 char buf[sizeof(struct T_dynamicCondition)];
                 memset(buf, 0, sizeof(buf));
-                memcpy(buf, receivedData, sizeof(struct T_dynamicCondition));
+                memcpy(buf, receivedData, std::min(sizeof(receivedData), sizeof(struct T_dynamicCondition)));
                 gpi_storeDynMachineConditions(buf);
             } else {
                 gpi_storeDynMachineConditions(receivedData);