diff --git a/packages/tsc/src/tsc.ts b/packages/tsc/src/tsc.ts
index 22957b8..f177bde 100644
--- a/packages/tsc/src/tsc.ts
+++ b/packages/tsc/src/tsc.ts
@@ -202,6 +202,12 @@ function runBuildOnce(options: CommandLineArguments): boolean {
                 syntheticSourceFiles.set(d.file.fileName, sf);
             }
             d.file = syntheticSourceFiles.get(d.file.fileName);
+
+            if (!('__syndicate_translated__' in d)) {
+                const p = info.targetToSourceMap.get(d.start)!;
+                d.start = p.firstItem.start.pos + p.offset;
+                (d as any).__syndicate_translated__ = true;
+            }
         }
     }