diff --git a/source/main/resources/rig_def_fileformat/RigDef_File.h b/source/main/resources/rig_def_fileformat/RigDef_File.h
index 6de0ea44b5..b5daace720 100644
--- a/source/main/resources/rig_def_fileformat/RigDef_File.h
+++ b/source/main/resources/rig_def_fileformat/RigDef_File.h
@@ -1826,14 +1826,14 @@ struct Screwprop
 
 struct SlideNode
 {
-    BITMASK_PROPERTY( constraint_flags, 1, CONSTRAINT_ATTACH_ALL     , HasConstraint_a_AttachAll     , SetConstraint_a_AttachAll     )   
-    BITMASK_PROPERTY( constraint_flags, 2, CONSTRAINT_ATTACH_FOREIGN , HasConstraint_f_AttachForeign , SetConstraint_f_AttachForeign )
-    BITMASK_PROPERTY( constraint_flags, 3, CONSTRAINT_ATTACH_SELF    , HasConstraint_s_AttachSelf 	 , SetConstraint_s_AttachSelf	 )
-    BITMASK_PROPERTY( constraint_flags, 4, CONSTRAINT_ATTACH_NONE    , HasConstraint_n_AttachNone 	 , SetConstraint_n_AttachNone	 )
+    static const BitMask_t CONSTRAINT_ATTACH_ALL     = BITMASK(1);
+    static const BitMask_t CONSTRAINT_ATTACH_FOREIGN = BITMASK(2);
+    static const BitMask_t CONSTRAINT_ATTACH_SELF    = BITMASK(3);
+    static const BitMask_t CONSTRAINT_ATTACH_NONE    = BITMASK(4);
 
     Node::Ref slide_node;
     std::vector<Node::Range> rail_node_ranges;
-    unsigned int constraint_flags;
+    BitMask_t constraint_flags = 0;
 
     // Optional args
     float spring_rate=0.f;      bool _spring_rate_set=false;
diff --git a/source/main/resources/rig_def_fileformat/RigDef_Serializer.cpp b/source/main/resources/rig_def_fileformat/RigDef_Serializer.cpp
index 9c3b71ec0f..c740241354 100644
--- a/source/main/resources/rig_def_fileformat/RigDef_Serializer.cpp
+++ b/source/main/resources/rig_def_fileformat/RigDef_Serializer.cpp
@@ -1123,10 +1123,10 @@ void Serializer::ProcessSlideNodes(File::Module* module)
         if (def._max_attach_dist_set)  { m_stream << ", d" << def.max_attach_dist; }
 
         // Constraint flags (cX)
-             if (def.HasConstraint_a_AttachAll())     { m_stream << ", ca"; }
-        else if (def.HasConstraint_f_AttachForeign()) { m_stream << ", cf"; }
-        else if (def.HasConstraint_s_AttachSelf())    { m_stream << ", cs"; }
-        else if (def.HasConstraint_n_AttachNone())    { m_stream << ", cn"; }
+             if (BITMASK_IS_1(def.constraint_flags, SlideNode::CONSTRAINT_ATTACH_ALL    )) { m_stream << ", ca"; }
+        else if (BITMASK_IS_1(def.constraint_flags, SlideNode::CONSTRAINT_ATTACH_FOREIGN)) { m_stream << ", cf"; }
+        else if (BITMASK_IS_1(def.constraint_flags, SlideNode::CONSTRAINT_ATTACH_SELF   )) { m_stream << ", cs"; }
+        else if (BITMASK_IS_1(def.constraint_flags, SlideNode::CONSTRAINT_ATTACH_NONE   )) { m_stream << ", cn"; }
     }
     m_stream << endl << endl; // Empty line
 }