diff --git a/WellspringCS.cs b/WellspringCS.cs
index 5de4f3d..1e1764e 100644
--- a/WellspringCS.cs
+++ b/WellspringCS.cs
@@ -104,7 +104,8 @@ namespace WellspringCS
 			uint fontBytesLength,
 			IntPtr atlasJsonBytes,
 			uint atlasJsonBytesLength,
-			out float pixelsPerEm
+			out float pixelsPerEm,
+			out float distanceRange
 		);
 
 		[DllImport(nativeLibName, CallingConvention = CallingConvention.Cdecl)]