diff --git a/Jenkinsfile b/Jenkinsfile
index 0bd833041a7..ee726bd0d6c 100644
--- a/Jenkinsfile
+++ b/Jenkinsfile
@@ -13,7 +13,7 @@ pipeline {
 
   triggers {
     parameterizedCron(env.BRANCH_NAME == 'main' ? '''
-      H H(0-1) * * * %TARGET_PLATFORM=r202403;JDK_VERSION=21
+      H H(0-1) * * * %TARGET_PLATFORM=r202512;JDK_VERSION=21
       H H(3-4) * * * %TARGET_PLATFORM=latest;JDK_VERSION=25
       ''' : '')
   }
@@ -72,7 +72,7 @@ pipeline {
               export JAVA_${javaVersion()}_HOME=''
               jdkEnvVar='JAVA_HOME'
             fi
-            ./full-build.sh --tp=${selectedTargetPlatform()} \
+            ./full-build.sh --tp=${params.TARGET_PLATFORM} \
               -Pstrict-jdk-${javaVersion()} -Dtoolchain.jdk.env=\${jdkEnvVar}
           """
         }
@@ -146,17 +146,12 @@ def javaVersion() {
   return Integer.parseInt(params.JDK_VERSION)
 }
 
-/** returns true when this build was triggered by an upstream build */
-def isTriggeredByUpstream() {
-  return !"[]".equals(currentBuild.getBuildCauses('org.jenkinsci.plugins.workflow.support.steps.build.BuildUpstreamCause').toString())
-}
-
 /**
  * Returns the Eclipse version dependent on the selected target platform.
  * Result: '4.XX'
  */
 def eclipseVersion() {
-  def targetPlatform = selectedTargetPlatform()
+  def targetPlatform = params.TARGET_PLATFORM
   if (targetPlatform == 'latest') {
     return "4.40"
   } else {
@@ -167,24 +162,3 @@ def eclipseVersion() {
     return "4."+ (8+(monthsBetween/3))
   }
 }
-
-/**
- * The target platform is primarily defined by the build parameter TARGET_PLATFORM.
- * But when the build is triggered by upstream with at least Java version 21, 'latest'
- * is returned.
- */
-def selectedTargetPlatform() {
-    def tp = params.TARGET_PLATFORM
-    def isUpstream = isTriggeredByUpstream()
-    def javaVersion = javaVersion()
-
-    if (isTriggeredByUpstream() && javaVersion>=25) {
-        println("Choosing 'latest' target since this build was triggered by upstream with Java ${javaVersion}")
-        return 'latest'
-    } else if (isTriggeredByUpstream() && javaVersion>=21) {
-        println("Choosing 'r2025-12' target since this build was triggered by upstream with Java ${javaVersion}")
-        return 'r2025-12'
-    } else {
-        return tp
-    }
-}