diff --git a/qdlt/qdltbase.h b/qdlt/qdltbase.h
index 56db5836..bccc7496 100644
--- a/qdlt/qdltbase.h
+++ b/qdlt/qdltbase.h
@@ -26,7 +26,7 @@
 
 #include "export_rules.h"
 
-inline constexpr const auto DLT_MAX_MESSAGE_LEN = 1024*64;
+constexpr const auto DLT_MAX_MESSAGE_LEN = 1024*64;
 
 //! Base class for all DLT classes.
 /*!