diff --git a/.tekton/scanner-build.yaml b/.tekton/scanner-build.yaml
index 4bb0e7139..70765fc46 100644
--- a/.tekton/scanner-build.yaml
+++ b/.tekton/scanner-build.yaml
@@ -9,8 +9,9 @@ metadata:
     build.appstudio.redhat.com/target_branch: '{{target_branch}}'
     pipelinesascode.tekton.dev/max-keep-runs: "500"
     # TODO(ROX-21073): re-enable for all PR branches
-    pipelinesascode.tekton.dev/on-cel-expression: (event == "push" && target_branch.matches("^(master|release-.*)$")) || (event == "pull_request" && source_branch.matches("(konflux|appstudio|rhtap)"))
-  creationTimestamp: null
+    pipelinesascode.tekton.dev/on-cel-expression: |
+      (event == "push" && target_branch.matches("^(master|release-.*)$")) ||
+      (event == "pull_request" && (source_branch.matches("(konflux|appstudio|rhtap)") || body.pull_request.labels.exists(l, l.name == "konflux-build")))
   labels:
     appstudio.openshift.io/application: acs
     appstudio.openshift.io/component: scanner
diff --git a/.tekton/scanner-db-build.yaml b/.tekton/scanner-db-build.yaml
index f69610f3d..989b12224 100644
--- a/.tekton/scanner-db-build.yaml
+++ b/.tekton/scanner-db-build.yaml
@@ -9,8 +9,9 @@ metadata:
     build.appstudio.redhat.com/target_branch: '{{target_branch}}'
     pipelinesascode.tekton.dev/max-keep-runs: "500"
     # TODO(ROX-21073): re-enable for all PR branches
-    pipelinesascode.tekton.dev/on-cel-expression: (event == "push" && target_branch.matches("^(master|release-.*)$")) || (event == "pull_request" && source_branch.matches("(konflux|appstudio|rhtap)"))
-  creationTimestamp: null
+    pipelinesascode.tekton.dev/on-cel-expression: |
+      (event == "push" && target_branch.matches("^(master|release-.*)$")) ||
+      (event == "pull_request" && (source_branch.matches("(konflux|appstudio|rhtap)") || body.pull_request.labels.exists(l, l.name == "konflux-build")))
   labels:
     appstudio.openshift.io/application: acs
     appstudio.openshift.io/component: scanner-db
diff --git a/.tekton/scanner-db-slim-build.yaml b/.tekton/scanner-db-slim-build.yaml
index 0050b64c8..26ec97b14 100644
--- a/.tekton/scanner-db-slim-build.yaml
+++ b/.tekton/scanner-db-slim-build.yaml
@@ -9,8 +9,9 @@ metadata:
     build.appstudio.redhat.com/target_branch: '{{target_branch}}'
     pipelinesascode.tekton.dev/max-keep-runs: "500"
     # TODO(ROX-21073): re-enable for all PR branches
-    pipelinesascode.tekton.dev/on-cel-expression: (event == "push" && target_branch.matches("^(master|release-.*)$")) || (event == "pull_request" && source_branch.matches("(konflux|appstudio|rhtap)"))
-  creationTimestamp: null
+    pipelinesascode.tekton.dev/on-cel-expression: |
+      (event == "push" && target_branch.matches("^(master|release-.*)$")) ||
+      (event == "pull_request" && (source_branch.matches("(konflux|appstudio|rhtap)") || body.pull_request.labels.exists(l, l.name == "konflux-build")))
   labels:
     appstudio.openshift.io/application: acs
     appstudio.openshift.io/component: scanner-db-slim
diff --git a/.tekton/scanner-slim-build.yaml b/.tekton/scanner-slim-build.yaml
index 1c74f08ee..c02a6b2dd 100644
--- a/.tekton/scanner-slim-build.yaml
+++ b/.tekton/scanner-slim-build.yaml
@@ -9,8 +9,9 @@ metadata:
     build.appstudio.redhat.com/target_branch: '{{target_branch}}'
     pipelinesascode.tekton.dev/max-keep-runs: "500"
     # TODO(ROX-21073): re-enable for all PR branches
-    pipelinesascode.tekton.dev/on-cel-expression: (event == "push" && target_branch.matches("^(master|release-.*)$")) || (event == "pull_request" && source_branch.matches("(konflux|appstudio|rhtap)"))
-  creationTimestamp: null
+    pipelinesascode.tekton.dev/on-cel-expression: |
+      (event == "push" && target_branch.matches("^(master|release-.*)$")) ||
+      (event == "pull_request" && (source_branch.matches("(konflux|appstudio|rhtap)") || body.pull_request.labels.exists(l, l.name == "konflux-build")))
   labels:
     appstudio.openshift.io/application: acs
     appstudio.openshift.io/component: scanner-slim