diff --git a/source/game/StarCollisionBlock.cpp b/source/game/StarCollisionBlock.cpp
index dfe3204..cbcba54 100644
--- a/source/game/StarCollisionBlock.cpp
+++ b/source/game/StarCollisionBlock.cpp
@@ -2,6 +2,9 @@
 
 namespace Star {
 
+CollisionSet const DefaultCollisionSet({CollisionKind::Null, CollisionKind::Slippery, CollisionKind::Dynamic, CollisionKind::Block});
+CollisionSet const BlockCollisionSet({CollisionKind::Block, CollisionKind::Slippery});
+
 EnumMap<TileCollisionOverride> const TileCollisionOverrideNames = {
     {TileCollisionOverride::None, "None"},
     {TileCollisionOverride::Empty, "Empty"},
diff --git a/source/game/StarCollisionBlock.hpp b/source/game/StarCollisionBlock.hpp
index b24f650..bce745d 100644
--- a/source/game/StarCollisionBlock.hpp
+++ b/source/game/StarCollisionBlock.hpp
@@ -53,10 +53,10 @@ private:
 };
 
 // The default CollisionSet consists of Null, Slippery, Dynamic and Block
-CollisionSet const DefaultCollisionSet({CollisionKind::Null, CollisionKind::Slippery, CollisionKind::Dynamic, CollisionKind::Block});
+extern CollisionSet const DefaultCollisionSet;
 
 // Defines what can be "blocks" e.g. for tile rendering: Block and Slippery
-CollisionSet const BlockCollisionSet({CollisionKind::Block, CollisionKind::Slippery});
+extern CollisionSet const BlockCollisionSet;
 
 extern EnumMap<TileCollisionOverride> const TileCollisionOverrideNames;