diff --git a/doomsday/plugins/wadmapconverter/include/id1map.h b/doomsday/plugins/wadmapconverter/include/id1map.h
index a1c594308f..30bc12251c 100644
--- a/doomsday/plugins/wadmapconverter/include/id1map.h
+++ b/doomsday/plugins/wadmapconverter/include/id1map.h
@@ -30,6 +30,12 @@
 #include <vector>
 #include <list>
 
+/// Material dictionary groups.
+typedef enum materialdictgroup_e {
+    MG_PLANE = 0,
+    MG_WALL
+} MaterialDictGroup;
+
 typedef std::vector<mline_t> Lines;
 typedef std::vector<mside_t> Sides;
 typedef std::vector<msector_t> Sectors;
diff --git a/doomsday/plugins/wadmapconverter/include/id1map_datatypes.h b/doomsday/plugins/wadmapconverter/include/id1map_datatypes.h
index fba0318dd0..c56418fbd7 100644
--- a/doomsday/plugins/wadmapconverter/include/id1map_datatypes.h
+++ b/doomsday/plugins/wadmapconverter/include/id1map_datatypes.h
@@ -25,7 +25,10 @@
 #include "dd_types.h"
 #include "id1map_util.h"
 
-/// Sizes of the map data structures in the arrived map formats (in int8_ts).
+/// Type used to identify references to materials in the material dictionary.
+typedef StringPoolId MaterialDictId;
+
+/// Sizes of the map data structures in the arrived map formats (in bytes).
 #define SIZEOF_64VERTEX         (4 * 2)
 #define SIZEOF_VERTEX           (2 * 2)
 #define SIZEOF_64THING          (2 * 7)
@@ -40,19 +43,6 @@
 #define SIZEOF_SECTOR           (2 * 5 + 8 * 2)
 #define SIZEOF_LIGHT            (1 * 6)
 
-/// Type used to identify references to materials in the material dictionary.
-typedef StringPoolId MaterialDictId;
-
-/// Material dictionary groups.
-typedef enum materialdictgroup_e {
-    MG_PLANE = 0,
-    MG_WALL
-} MaterialDictGroup;
-
-/// Line sides.
-#define RIGHT                   0
-#define LEFT                    1
-
 typedef struct mside_s {
     int16_t         offset[2];
     MaterialDictId  topMaterial;
@@ -61,6 +51,10 @@ typedef struct mside_s {
     uint            sector;
 } mside_t;
 
+/// Line sides.
+#define RIGHT                   0
+#define LEFT                    1
+
 /**
  * @defgroup lineAnalysisFlags  Line Analysis flags
  */