diff --git a/src/gui_dwrite.cpp b/src/gui_dwrite.cpp
index d4c43a3..08b81c4 100644
--- a/src/gui_dwrite.cpp
+++ b/src/gui_dwrite.cpp
@@ -686,7 +686,7 @@
 
 	if (SUCCEEDED(hr))
 	{
-	    DWRITE_TEXT_RANGE textRange = { 0, len };
+	    DWRITE_TEXT_RANGE textRange = { 0, (UINT32)len };
 	    textLayout->SetFontWeight(mFontWeight, textRange);
 	    textLayout->SetFontStyle(mFontStyle, textRange);
 	}