diff --git a/webrtc/modules/desktop_capture/win/dxgi_output_duplicator.cc b/webrtc/modules/desktop_capture/win/dxgi_output_duplicator.cc
index 122ad1f6e1..9c0f14c43d 100644
--- a/webrtc/modules/desktop_capture/win/dxgi_output_duplicator.cc
+++ b/webrtc/modules/desktop_capture/win/dxgi_output_duplicator.cc
@@ -163,8 +163,8 @@ bool DxgiOutputDuplicator::Duplicate(Context* context,
     const DesktopFrame& source = texture_->AsDesktopFrame();
     for (DesktopRegion::Iterator it(updated_region); !it.IsAtEnd();
          it.Advance()) {
-      target->CopyPixelsFrom(source, SourceRect(it.rect()).top_left(),
-                             TargetRect(it.rect(), offset));
+      target->CopyPixelsFrom(
+          source, SourceRect(it.rect()).top_left(), it.rect());
     }
     last_frame_ = target->Share();
     last_frame_offset_ = offset;
@@ -177,8 +177,7 @@ bool DxgiOutputDuplicator::Duplicate(Context* context,
     // export last frame to the target.
     for (DesktopRegion::Iterator it(updated_region); !it.IsAtEnd();
          it.Advance()) {
-      target->CopyPixelsFrom(*last_frame_, SourceRect(it.rect()).top_left(),
-                             TargetRect(it.rect(), offset));
+      target->CopyPixelsFrom(*last_frame_, it.rect().top_left(), it.rect());
     }
     target->mutable_updated_region()->AddRegion(updated_region);
   }
@@ -302,11 +301,4 @@ DesktopRect DxgiOutputDuplicator::SourceRect(DesktopRect rect) {
   return rect;
 }
 
-DesktopRect DxgiOutputDuplicator::TargetRect(DesktopRect rect,
-                                             DesktopVector offset) {
-  rect = SourceRect(rect);
-  rect.Translate(offset);
-  return rect;
-}
-
 }  // namespace webrtc
diff --git a/webrtc/modules/desktop_capture/win/dxgi_output_duplicator.h b/webrtc/modules/desktop_capture/win/dxgi_output_duplicator.h
index 0d5b134796..b57569014f 100644
--- a/webrtc/modules/desktop_capture/win/dxgi_output_duplicator.h
+++ b/webrtc/modules/desktop_capture/win/dxgi_output_duplicator.h
@@ -108,9 +108,6 @@ class DxgiOutputDuplicator {
   // Returns a DesktopRect in the coordinate of |texture_|->AsDesktopFrame().
   DesktopRect SourceRect(DesktopRect rect);
 
-  // Returns a DesktopRect in the coordinate of |offset|.
-  DesktopRect TargetRect(DesktopRect rect, DesktopVector offset);
-
   const D3dDevice device_;
   const Microsoft::WRL::ComPtr<IDXGIOutput1> output_;
   const DesktopRect desktop_rect_;