diff --git a/package.json b/package.json
index 24c1d4ab..68ac9f8d 100644
--- a/package.json
+++ b/package.json
@@ -73,12 +73,12 @@
     "lint": "gts check",
     "compile": "tsc -p .",
     "fix": "gts fix",
-    "pretest": "npm run compile",
+    "pretest": "npm run compile -- --sourceMap",
     "docs": "compodoc src/",
     "samples-setup": "cd samples/ && npm link ../ && npm run setup && cd ../",
     "samples-test": "cd samples/ && npm link ../ && npm test && cd ../",
     "system-test": "mocha build/system-test --timeout 60000",
-    "presystem-test": "npm run compile",
+    "presystem-test": "npm run compile --sourceMap",
     "webpack": "webpack",
     "browser-test": "karma start",
     "docs-test": "linkinator docs",