diff --git a/ci-job-validation.groovy b/ci-job-validation.groovy
index 8aefae4ca..41ad22af5 100644
--- a/ci-job-validation.groovy
+++ b/ci-job-validation.groovy
@@ -29,7 +29,9 @@ node('cico-workspace') {
 		}
 
 		sh "git clone --depth=1 --branch='${git_since}' '${git_repo}' ~/build/ceph-csi"
-		sh "cd ~/build/ceph-csi && git fetch origin ${ref} && git checkout -b ${ref} FETCH_HEAD"
+		if (ref != git_since) {
+			sh "cd ~/build/ceph-csi && git fetch origin ${ref} && git checkout -b ${ref} FETCH_HEAD"
+		}
 	}
 
 	stage('check doc-only change') {
diff --git a/containerized-tests.groovy b/containerized-tests.groovy
index 6d08f55dd..6ce1b3f71 100644
--- a/containerized-tests.groovy
+++ b/containerized-tests.groovy
@@ -47,7 +47,9 @@ node('cico-workspace') {
 		}
 
 		sh "git clone --depth=1 --branch='${git_since}' '${git_repo}' ~/build/ceph-csi"
-		sh "cd ~/build/ceph-csi && git fetch origin ${ref} && git checkout -b ${ref} FETCH_HEAD"
+		if (ref != git_since) {
+			sh "cd ~/build/ceph-csi && git fetch origin ${ref} && git checkout -b ${ref} FETCH_HEAD"
+		}
 	}
 
 	stage('check doc-only change') {
diff --git a/k8s-e2e-external-storage.groovy b/k8s-e2e-external-storage.groovy
index a057ed0e3..b5a3f80cd 100644
--- a/k8s-e2e-external-storage.groovy
+++ b/k8s-e2e-external-storage.groovy
@@ -57,7 +57,9 @@ node('cico-workspace') {
 		}
 
 		sh "git clone --depth=1 --branch='${git_since}' '${git_repo}' ~/build/ceph-csi"
-		sh "cd ~/build/ceph-csi && git fetch origin ${ref} && git checkout -b ${ref} FETCH_HEAD"
+		if (ref != git_since) {
+			sh "cd ~/build/ceph-csi && git fetch origin ${ref} && git checkout -b ${ref} FETCH_HEAD"
+		}
 	}
 
 	stage('check doc-only change') {
diff --git a/mini-e2e-helm.groovy b/mini-e2e-helm.groovy
index 11a839a96..400e08ccd 100644
--- a/mini-e2e-helm.groovy
+++ b/mini-e2e-helm.groovy
@@ -73,7 +73,9 @@ node('cico-workspace') {
 		}
 
 		sh "git clone --depth=1 --branch='${git_since}' '${git_repo}' ~/build/ceph-csi"
-		sh "cd ~/build/ceph-csi && git fetch origin ${ref} && git checkout -b ${ref} FETCH_HEAD"
+		if (ref != git_since) {
+			sh "cd ~/build/ceph-csi && git fetch origin ${ref} && git checkout -b ${ref} FETCH_HEAD"
+		}
 	}
 
 	stage('check doc-only change') {
diff --git a/mini-e2e.groovy b/mini-e2e.groovy
index 6edc38fb9..30cc39246 100644
--- a/mini-e2e.groovy
+++ b/mini-e2e.groovy
@@ -70,7 +70,9 @@ node('cico-workspace') {
 		}
 
 		sh "git clone --depth=1 --branch='${git_since}' '${git_repo}' ~/build/ceph-csi"
-		sh "cd ~/build/ceph-csi && git fetch origin ${ref} && git checkout -b ${ref} FETCH_HEAD"
+		if (ref != git_since) {
+			sh "cd ~/build/ceph-csi && git fetch origin ${ref} && git checkout -b ${ref} FETCH_HEAD"
+		}
 	}
 
 	stage('check doc-only change') {
diff --git a/upgrade-tests.groovy b/upgrade-tests.groovy
index 37465c8e7..cfdb30669 100644
--- a/upgrade-tests.groovy
+++ b/upgrade-tests.groovy
@@ -70,7 +70,9 @@ node('cico-workspace') {
 		}
 
 		sh "git clone --depth=1 --branch='${git_since}' '${git_repo}' ~/build/ceph-csi"
-		sh "cd ~/build/ceph-csi && git fetch origin ${ref} && git checkout -b ${ref} FETCH_HEAD"
+		if (ref != git_since) {
+			sh "cd ~/build/ceph-csi && git fetch origin ${ref} && git checkout -b ${ref} FETCH_HEAD"
+		}
 	}
 
 	stage('check doc-only change') {