diff --git a/src/sksl/ir/SkSLLayout.h b/src/sksl/ir/SkSLLayout.h
index 5c99807ab5..50c88b45c9 100644
--- a/src/sksl/ir/SkSLLayout.h
+++ b/src/sksl/ir/SkSLLayout.h
@@ -181,7 +181,7 @@ struct Layout {
             separator = ", ";
         }
         if (fInputAttachmentIndex >= 0) {
-            result += separator + "input_attachment_index = " + to_string(fBuiltin);
+            result += separator + "input_attachment_index = " + to_string(fInputAttachmentIndex);
             separator = ", ";
         }
         if (Format::kUnspecified != fFormat) {