diff --git a/src/camera.h b/src/camera.h
index 8321a1f0d..973ae3f31 100644
--- a/src/camera.h
+++ b/src/camera.h
@@ -29,7 +29,7 @@ with this program; if not, write to the Free Software Foundation, Inc.,
 #include <IAnimatedMesh.h>
 
 class LocalPlayer;
-class MapDrawControl;
+struct MapDrawControl;
 class ExtrudedSpriteSceneNode;
 class IGameDef;
 
diff --git a/src/inventory.h b/src/inventory.h
index a303fa0de..24591f33f 100644
--- a/src/inventory.h
+++ b/src/inventory.h
@@ -31,7 +31,7 @@ with this program; if not, write to the Free Software Foundation, Inc.,
 
 class ServerActiveObject;
 class ServerEnvironment;
-class PointedThing;
+struct PointedThing;
 class ITextureSource;
 class IGameDef;
 
diff --git a/src/materials.h b/src/materials.h
index 9db33fc63..bcf930581 100644
--- a/src/materials.h
+++ b/src/materials.h
@@ -93,7 +93,7 @@ struct DiggingProperties
 	u16 wear;
 };
 
-class ToolDiggingProperties;
+struct ToolDiggingProperties;
 class INodeDefManager;
 
 DiggingProperties getDiggingProperties(u16 content, ToolDiggingProperties *tp,