diff --git a/.c8rc.json b/.c8rc.json
deleted file mode 100644
index 1311dc1b7..000000000
--- a/.c8rc.json
+++ /dev/null
@@ -1,14 +0,0 @@
-{
-  "reporter": ["text", "html", "lcov"],
-  "include": [
-    "build/lib-legacy/core/**/*.js",
-    "build/lib-legacy/display/**/*.js",
-    "build/lib-legacy/shared/**/*.js",
-    "build/lib-legacy/web/**/*.js"
-  ],
-  "exclude": ["build/lib-legacy/test/**"],
-  "all": false,
-  "check-coverage": false,
-  "report-dir": "./build/coverage",
-  "temp-directory": "./build/.c8_output"
-}
diff --git a/gulpfile.mjs b/gulpfile.mjs
index c103614cd..6bc953fba 100644
--- a/gulpfile.mjs
+++ b/gulpfile.mjs
@@ -1725,7 +1725,7 @@ function buildLibHelper(bundleDefines, inputStream, outputDir) {
           "babel-plugin-istanbul",
           {
             cwd: __dirname,
-            include: ["src/**/*.js", "web/**/*.js"],
+            include: ["external/**/*.js", "src/**/*.js", "web/**/*.js"],
           },
         ]);
       }