diff --git a/pnpm-workspace.yaml b/pnpm-workspace.yaml
index b52bd647..ac0ebf65 100644
--- a/pnpm-workspace.yaml
+++ b/pnpm-workspace.yaml
@@ -16,7 +16,11 @@ allowBuilds:
   msgpackr-extract: false
   nice-napi: false
   oracledb: false
-  phantomjs-prebuilt: true
+  # phantomjs-prebuilt (deprecated) downloads and extracts a binary from GitHub
+  # releases in its postinstall, which fails to extract on macOS/Windows and
+  # breaks CI. That postinstall only generates lib/location.js, which the trace
+  # test does not need. Skip the build so installs are reliable everywhere.
+  phantomjs-prebuilt: false
   protobufjs: false
   sharp: false
   unix-dgram: false
diff --git a/test/unit/phantomjs-prebuilt/output.js b/test/unit/phantomjs-prebuilt/output.js
index 6f4dd301..37611aec 100644
--- a/test/unit/phantomjs-prebuilt/output.js
+++ b/test/unit/phantomjs-prebuilt/output.js
@@ -2,7 +2,6 @@
   "node_modules/es6-promise/dist/es6-promise.js",
   "node_modules/es6-promise/package.json",
   "node_modules/phantomjs-prebuilt/bin/phantomjs",
-  "node_modules/phantomjs-prebuilt/lib/location.js",
   "node_modules/phantomjs-prebuilt/lib/phantomjs.js",
   "node_modules/phantomjs-prebuilt/package.json",
   "package.json",