diff --git a/src/Core/Resource/CTexture.cpp b/src/Core/Resource/CTexture.cpp
index 1c4620f1..8007d3f6 100644
--- a/src/Core/Resource/CTexture.cpp
+++ b/src/Core/Resource/CTexture.cpp
@@ -290,7 +290,7 @@ void CTexture::CalcLinearSize()
     mLinearSize = static_cast<uint32>(mWidth * mHeight * BytesPerPixel);
 }
 
-uint32 CTexture::CalcTotalSize()
+uint32 CTexture::CalcTotalSize() const
 {
     const float BytesPerPixel = FormatBPP(mTexelFormat) / 8.f;
     uint32 MipW = mWidth, MipH = mHeight;
diff --git a/src/Core/Resource/CTexture.h b/src/Core/Resource/CTexture.h
index c4220e3a..71751de9 100644
--- a/src/Core/Resource/CTexture.h
+++ b/src/Core/Resource/CTexture.h
@@ -63,7 +63,7 @@ public:
     // Private
 private:
     void CalcLinearSize();
-    uint32 CalcTotalSize();
+    uint32 CalcTotalSize() const;
     void CopyGLBuffer();
     void DeleteBuffers();
 };