diff --git a/DDTest/src/test_surface.cc b/DDTest/src/test_surface.cc
index 1a0445441a59ea57239b51673e9413d517e1986a..4b02c228533c0f57767aea30aba4dd89f89f6a7f 100644
--- a/DDTest/src/test_surface.cc
+++ b/DDTest/src/test_surface.cc
@@ -119,15 +119,15 @@ int main(int argc, char** argv ){
     MaterialData sm( mat ) ;
 
     // material properies of Si :
-    test( STR( sm.A() )  , STR( 28.0854 ) , "   MaterialData.A() == 28.0854 " ) ; 
+    test( STR( sm.A() )  , STR( 28.0855 ) , "   MaterialData.A() == 28.0855 " ) ; 
 
     test( STR( sm.Z() )  , STR( 14 ) , "   MaterialData.Z() == 14 " ) ; 
 
     test( STR( sm.density() )  , STR( 2.33 ) , "   MaterialData.density() == 2.33 " ) ; 
 
-    test( STR( sm.radiationLength() / dd4hep::mm )  , STR( 93.4957 ) , "   MaterialData.radiationLength() == 93.4957 * mm " ) ; 
+    test( STR( sm.radiationLength() / dd4hep::mm )  , STR( 93.4961 ) , "   MaterialData.radiationLength() == 93.4961 * mm " ) ; 
 
-    test( STR( sm.interactionLength() / dd4hep::mm )  , STR( 457.53 ) , "   MaterialData.interactionLength() == 457.53 * mm " ) ; 
+    test( STR( sm.interactionLength() / dd4hep::mm )  , STR( 457.532 ) , "   MaterialData.interactionLength() == 457.532 * mm " ) ;