diff --git a/Source/Engine/Render2D/SpriteAtlas.cpp b/Source/Engine/Render2D/SpriteAtlas.cpp
index b1a941ba1..217c950c4 100644
--- a/Source/Engine/Render2D/SpriteAtlas.cpp
+++ b/Source/Engine/Render2D/SpriteAtlas.cpp
@@ -40,6 +40,23 @@ SpriteAtlas::SpriteAtlas(const SpawnParams& params, const AssetInfo* info)
 {
 }
 
+int32 SpriteAtlas::GetSpritesCount() const
+{
+    return Sprites.Count();
+}
+
+Sprite SpriteAtlas::GetSprite(int32 index) const
+{
+    CHECK_RETURN(index >= 0 && index < Sprites.Count(), Sprite())
+    return Sprites.Get()[index];
+}
+
+void SpriteAtlas::SetSprite(int32 index, const Sprite& value)
+{
+    CHECK(index >= 0 && index < Sprites.Count());
+    Sprites[index] = value;
+}
+
 SpriteHandle SpriteAtlas::FindSprite(const StringView& name) const
 {
     SpriteHandle result(const_cast<SpriteAtlas*>(this), -1);
diff --git a/Source/Engine/Render2D/SpriteAtlas.h b/Source/Engine/Render2D/SpriteAtlas.h
index 9631b9ac9..6845de610 100644
--- a/Source/Engine/Render2D/SpriteAtlas.h
+++ b/Source/Engine/Render2D/SpriteAtlas.h
@@ -111,32 +111,21 @@ public:
     /// <summary>
     /// Gets the sprites count.
     /// </summary>
-    /// <returns>The sprites count.</returns>
-    API_PROPERTY() int32 GetSpritesCount() const
-    {
-        return Sprites.Count();
-    }
+    API_PROPERTY() int32 GetSpritesCount() const;
 
     /// <summary>
     /// Gets the sprite data.
     /// </summary>
     /// <param name="index">The index.</param>
     /// <returns>The sprite data.</returns>
-    API_FUNCTION() Sprite GetSprite(const int32 index) const
-    {
-        return Sprites[index];
-    }
+    API_FUNCTION() Sprite GetSprite(int32 index) const;
 
     /// <summary>
     /// Sets the sprite data.
     /// </summary>
     /// <param name="index">The index.</param>
     /// <param name="value">The sprite data.</param>
-    /// <returns>The sprite handle.</returns>
-    API_FUNCTION() void SetSprite(const int32 index, API_PARAM(Ref) const Sprite& value)
-    {
-        Sprites[index] = value;
-    }
+    API_FUNCTION() void SetSprite(int32 index, API_PARAM(Ref) const Sprite& value);
 
     /// <summary>
     /// Finds the sprite by the name.