diff --git a/Jenkinsfile b/Jenkinsfile
index a8db433..d414967 100644
--- a/Jenkinsfile
+++ b/Jenkinsfile
@@ -10,7 +10,7 @@
 
 def agent_root_folder = '/var/lib/jenkins'
 
-if (${params.report_number}){
+if ("${params.report_number}"){
 	// load the build report's content if present
 	def text
 	String reportURL = "https://code-repo.d4science.org/gCubeCI/gCubeReleases/raw/branch/master/open/${gCube_release_version}/build_commits.${params.report_number}.csv"