diff --git a/jenkins/spack-PR b/jenkins/spack-PR
index 322dd30209..e9be0ac87c 100644
--- a/jenkins/spack-PR
+++ b/jenkins/spack-PR
@@ -1,3 +1,18 @@
+def repo_identifier = "Project"
+def spack_fork = "C2SM"
+def spack_branch = "main"
+String[] triggerPhrase = env.ghprbCommentBody.split(" ")
+
+def parseTriggerPhrase(it) {
+    fork = it.split("=")[1].split("/")[0]
+    branch = it.split("=")[1].split("/")[1]
+    return [fork, branch]
+}
+triggerPhrase.each {
+    if(it.contains("spack${repo_identifier}")) {
+        (spack_fork, spack_branch) = parseTriggerPhrase(it)
+    }
+}
 pipeline {
     agent none
     stages {
@@ -20,7 +35,7 @@ pipeline {
                     stage('Clone Repos') {
                         steps {
                             sh """
-                            git clone --depth 1 --recurse-submodules --shallow-submodules https://github.com/C2SM/spack-c2sm.git
+                            git clone --depth 1 --recurse-submodules --shallow-submodules -b '${spack_branch}' https://github.com/${spack_fork}/spack-c2sm.git
                             git clone . local_copy
                             """
                         }
diff --git a/jenkins/spack-PR-icon b/jenkins/spack-PR-icon
index 7cadc494df..4d0fe56c22 100644
--- a/jenkins/spack-PR-icon
+++ b/jenkins/spack-PR-icon
@@ -1,11 +1,9 @@
 def repo_identifier = "Project"
 def icon_fork = "C2SM"
 def icon_branch = "icon-dsl"
-def icon_default = true
 
 def spack_fork = "C2SM"
 def spack_branch = "main"
-def spack_default = true
 
 def gt4py_fork = "GridTools"
 def gt4py_branch = "icon4py_20230621"
@@ -20,19 +18,16 @@ def parseTriggerPhrase(it) {
 triggerPhrase.each {
     if(it.contains("icon${repo_identifier}")) {
         (icon_fork, icon_branch) = parseTriggerPhrase(it)
-        icon_default = false
     }
 }
 triggerPhrase.each {
     if(it.contains("spack${repo_identifier}")) {
         (spack_fork, spack_branch) = parseTriggerPhrase(it)
-        spack_default = false
     }
 }
 triggerPhrase.each {
     if(it.contains("gt4py${repo_identifier}")) {
         (gt4py_fork, gt4py_branch) = parseTriggerPhrase(it)
-        gt4py_default = false
     }
 }
 
diff --git a/jenkins/spack-PR-stable b/jenkins/spack-PR-stable
index 78b85b9961..b2a317a4ff 100644
--- a/jenkins/spack-PR-stable
+++ b/jenkins/spack-PR-stable
@@ -1,3 +1,18 @@
+def repo_identifier = "Project"
+def spack_fork = "C2SM"
+def spack_branch = "main"
+String[] triggerPhrase = env.ghprbCommentBody.split(" ")
+
+def parseTriggerPhrase(it) {
+    fork = it.split("=")[1].split("/")[0]
+    branch = it.split("=")[1].split("/")[1]
+    return [fork, branch]
+}
+triggerPhrase.each {
+    if(it.contains("spack${repo_identifier}")) {
+        (spack_fork, spack_branch) = parseTriggerPhrase(it)
+    }
+}
 pipeline {
     agent none
     stages {
@@ -20,7 +35,7 @@ pipeline {
                     stage('Clone Repos') {
                         steps {
                             sh """
-                            git clone --depth 1 --recurse-submodules --shallow-submodules https://github.com/C2SM/spack-c2sm.git
+                            git clone --depth 1 --recurse-submodules --shallow-submodules -b '${spack_branch}' https://github.com/${spack_fork}/spack-c2sm.git
                             git clone . local_copy
                             """
                         }