diff --git a/src/tint/lang/wgsl/reader/parser/parser.cc b/src/tint/lang/wgsl/reader/parser/parser.cc
index 2abc56e..4a5660a 100644
--- a/src/tint/lang/wgsl/reader/parser/parser.cc
+++ b/src/tint/lang/wgsl/reader/parser/parser.cc
@@ -3050,7 +3050,7 @@
                 }
                 match(Token::Type::kComma);
 
-                return builder_.Builtin(name.value);
+                return builder_.Builtin(t.source(), name.value);
             });
     }