diff --git a/src/gfx.cpp b/src/gfx.cpp
--- a/src/gfx.cpp
+++ b/src/gfx.cpp
@@ -574,7 +574,7 @@ int GetStringLineCount(StringID str, int
 	GetString(buffer, str, lastof(buffer));
 
 	Layouter layout(buffer, maxw);
-	return layout.size();
+	return (uint)layout.size();
 }
 
 /**