diff --git a/packages/google-cloud-pubsub-api/package.json b/packages/google-cloud-pubsub-api/package.json
index b4d6f59f133..8dfa9210168 100644
--- a/packages/google-cloud-pubsub-api/package.json
+++ b/packages/google-cloud-pubsub-api/package.json
@@ -32,12 +32,13 @@
   ],
   "scripts": {
     "clean": "gts clean",
-    "compile": "tsc -p . && cp -r protos build/ && minifyProtoJson",
+    "compile": "tsc -p . && cp -r protos build/",
     "compile-protos": "compileProtos src",
     "docs": "jsdoc -c .jsdoc.js",
     "fix": "gts fix",
     "lint": "gts check",
-    "prepare": "npm run compile-protos && npm run compile",
+    "postpack": "minifyProtoJson",
+    "prepare": "npm run compile",
     "system-test": "node ../../bin/run-test.cjs --config ../../.mocharc.cjs --no-parallel build/system-test",
     "test": "node ../../bin/run-test.cjs --config ../../.mocharc.cjs build/test"
   },
diff --git a/packages/google-developer-knowledge/package.json b/packages/google-developer-knowledge/package.json
index 2830400cbea..ec6c4bd0925 100644
--- a/packages/google-developer-knowledge/package.json
+++ b/packages/google-developer-knowledge/package.json
@@ -30,12 +30,13 @@
   ],
   "scripts": {
     "clean": "gts clean",
-    "compile": "tsc -p . && cp -r protos build/ && minifyProtoJson",
+    "compile": "tsc -p . && cp -r protos build/",
     "compile-protos": "compileProtos src",
     "docs": "jsdoc -c .jsdoc.js",
     "fix": "gts fix",
     "lint": "gts check",
-    "prepare": "npm run compile-protos && npm run compile",
+    "postpack": "minifyProtoJson",
+    "prepare": "npm run compile",
     "system-test": "node ../../bin/run-test.cjs --config ../../.mocharc.cjs --no-parallel build/system-test",
     "test": "node ../../bin/run-test.cjs --config ../../.mocharc.cjs build/test"
   },