diff --git a/external/mdal/frmts/mdal_binary_dat.cpp b/external/mdal/frmts/mdal_binary_dat.cpp
index 6166b2ab37c..30b89861162 100644
--- a/external/mdal/frmts/mdal_binary_dat.cpp
+++ b/external/mdal/frmts/mdal_binary_dat.cpp
@@ -33,8 +33,10 @@ static const int CT_NUMCELLS  = 180;
 static const int CT_NAME      = 190;
 static const int CT_TS        = 200;
 static const int CT_ENDDS     = 210;
+#if 0
 static const int CT_RT_JULIAN = 240;
 static const int CT_TIMEUNITS = 250;
+#endif
 
 static const int CT_2D_MESHES = 3;
 static const int CT_FLOAT_SIZE = 4;