diff --git a/packages/ts-plugin/src/index.ts b/packages/ts-plugin/src/index.ts
index ecbc0ac..6084aa2 100644
--- a/packages/ts-plugin/src/index.ts
+++ b/packages/ts-plugin/src/index.ts
@@ -55,20 +55,22 @@ const boot: tslib.server.PluginModuleFactory = ({ typescript: ts }) => {
         span(s: undefined): undefined;
         span(s: ts.TextSpan | undefined): ts.TextSpan | undefined;
         span(s: ts.TextSpan | undefined): ts.TextSpan | undefined {
-            if (s !== void 0) {
+            if (s !== void 0 && !('__syndicate_translated__' in s)) {
                 const newStart = this.loc(s.start);
                 if (newStart === void 0) throw new Error("Source position unavailable for TextSpan " + JSON.stringify(s));
                 s.start = newStart;
+                (s as any).__syndicate_translated__ = true;
             }
             return s;
         }
 
         diagnostic<T extends ts.Diagnostic>(d: T, ds: T[]) {
-            if (d.start !== void 0) {
+            if (d.start !== void 0 && !('__syndicate_translated__' in d)) {
                 const p = this.info.targetToSourceMap.get(d.start);
                 if (p === null) return;
                 if (p.firstItem.synthetic) return;
                 d.start = p.firstItem.start.pos + p.offset;
+                (d as any).__syndicate_translated__ = true;
             }
             ds.push(d);
         }