diff --git a/tools/generate_datatypes.py b/tools/generate_datatypes.py
index 9cb61dd4e16..fad57fa880a 100755
--- a/tools/generate_datatypes.py
+++ b/tools/generate_datatypes.py
@@ -237,9 +237,9 @@ def __init__(self, outname, xml, namespace):
                 self.pointerfree = "false"
                 self.overlayable = "false"
             else:
-                self.overlayable += " && " + m.memberType.overlayable
+                self.overlayable += "\n\t\t && " + m.memberType.overlayable
                 if before:
-                    self.overlayable += " && offsetof(UA_%s, %s) == (offsetof(UA_%s, %s) + sizeof(UA_%s))" % \
+                    self.overlayable += "\n\t\t && offsetof(UA_%s, %s) == (offsetof(UA_%s, %s) + sizeof(UA_%s))" % \
                                         (self.name, m.name, self.name, before.name, before.memberType.name)
             if "false" in self.overlayable:
                 self.overlayable = "false"