diff --git a/include/fast/backends/gfx_direct3d_common.h b/include/fast/backends/gfx_direct3d_common.h
index bfe5f96..16f96ea 100644
--- a/include/fast/backends/gfx_direct3d_common.h
+++ b/include/fast/backends/gfx_direct3d_common.h
@@ -163,8 +163,7 @@ class GfxRenderingAPIDX11 final : public GfxRenderingAPI {
 
     struct ShaderProgramD3D11* mShaderProgram;
 
-    // uint32_t current_width, current_height;
-    uint32_t mRenderTargetHeight;
+    int32_t mRenderTargetHeight;
     int mCurrentFramebuffer;
     FilteringMode mCurrentFilterMode = FILTER_NONE;
 
diff --git a/include/fast/backends/gfx_metal.h b/include/fast/backends/gfx_metal.h
index b926895..999d5ac 100644
--- a/include/fast/backends/gfx_metal.h
+++ b/include/fast/backends/gfx_metal.h
@@ -203,7 +203,7 @@ class GfxRenderingAPIMetal final : public GfxRenderingAPI {
     int mCurrentTile;
     uint32_t mCurrentTextureIds[SHADER_MAX_TEXTURES];
 
-    uint32_t mRenderTargetHeight;
+    int32_t mRenderTargetHeight;
     int mCurrentFramebuffer;
     size_t mCurrentVertexBufferOffset;
     FilteringMode mCurrentFilterMode = FILTER_THREE_POINT;