diff --git a/build/lib/tsb/builder.js b/build/lib/tsb/builder.js
index 1a08badd113..71c7a78e9a1 100644
--- a/build/lib/tsb/builder.js
+++ b/build/lib/tsb/builder.js
@@ -294,7 +294,7 @@ function createTypeScriptBuilder(config, projectFile, cmd) {
                         const jsValue = value.files.find(candidate => candidate.basename.endsWith('.js'));
                         if (jsValue) {
                             outHost.addScriptSnapshot(jsValue.path, new ScriptSnapshot(String(jsValue.contents), new Date()));
-                            toBeCheckedForCycles.push(jsValue.path);
+                            toBeCheckedForCycles.push(normalize(jsValue.path));
                         }
                     }).catch(e => {
                         // can't just skip this or make a result up..
diff --git a/build/lib/tsb/builder.ts b/build/lib/tsb/builder.ts
index 94fcf1483db..3ca3a0d6ead 100644
--- a/build/lib/tsb/builder.ts
+++ b/build/lib/tsb/builder.ts
@@ -315,7 +315,7 @@ export function createTypeScriptBuilder(config: IConfiguration, projectFile: str
 						const jsValue = value.files.find(candidate => candidate.basename.endsWith('.js'));
 						if (jsValue) {
 							outHost.addScriptSnapshot(jsValue.path, new ScriptSnapshot(String(jsValue.contents), new Date()));
-							toBeCheckedForCycles.push(jsValue.path);
+							toBeCheckedForCycles.push(normalize(jsValue.path));
 						}
 
 					}).catch(e => {