diff --git a/jenkins/scripts/VersionSelectorScript.groovy b/jenkins/scripts/VersionSelectorScript.groovy
index f9edff148..3abf70565 100644
--- a/jenkins/scripts/VersionSelectorScript.groovy
+++ b/jenkins/scripts/VersionSelectorScript.groovy
@@ -11,6 +11,10 @@ def noVer = { nodeVersion -> false }
 def releaseType = { buildType -> buildType == 'release' }
 def testType = { buildType -> buildType == 'test' }
 def anyType = { buildType -> true }
+// node-test-pull-request passes the pull ref down to every sub-job; daily
+// and release jobs pass a branch ref
+def isPullRequest = new String(parameters['GIT_REMOTE_REF'] ?: '') ==~ /refs\/pull\/.+/
+def prTestType = { buildType -> buildType == 'test' && isPullRequest }
 
 def buildExclusions = [
   // Given a machine label, build type (release or !release) and a Node.js
@@ -66,6 +70,11 @@ def buildExclusions = [
   [ /^osx13/,                         anyType,     gte(25) ],
   [ /^macos15/,                       anyType,     lt(25)  ],
 
+  // Not run for pull requests, node-daily-* still covers them
+  // https://github.com/nodejs/build/issues/4457
+  [ /^smartos/,                       prTestType,  allVer  ],
+  [ /^aix7/,                          prTestType,  allVer  ],
+
   // -------------------------------------------------------
 ]