diff --git a/OpenEXR/IlmImf/ImfDeepTiledInputPart.cpp b/OpenEXR/IlmImf/ImfDeepTiledInputPart.cpp
index 1262f23943..0f0c012a06 100644
--- a/OpenEXR/IlmImf/ImfDeepTiledInputPart.cpp
+++ b/OpenEXR/IlmImf/ImfDeepTiledInputPart.cpp
@@ -90,7 +90,7 @@ DeepTiledInputPart::isComplete () const
 unsigned int
 DeepTiledInputPart::tileXSize () const
 {
-    return file->isComplete();
+    return file->tileXSize();
 }