diff --git a/jjb/pipeline/omec-fossa-scan.groovy b/jjb/pipeline/omec-fossa-scan.groovy
index a6c2169..c70f3eb 100644
--- a/jjb/pipeline/omec-fossa-scan.groovy
+++ b/jjb/pipeline/omec-fossa-scan.groovy
@@ -71,7 +71,7 @@
                         #!/usr/bin/env bash
 
                         cd ${params.project}
-                        if [ ! -Z ${params.ghprbPullId} ]
+                        if [ ! -z ${params.ghprbPullId} ]
                         then
                           git checkout FETCH_HEAD
                         else
diff --git a/jjb/pipeline/omec-reuse-scan.groovy b/jjb/pipeline/omec-reuse-scan.groovy
index 9db0c9c..605f285 100644
--- a/jjb/pipeline/omec-reuse-scan.groovy
+++ b/jjb/pipeline/omec-reuse-scan.groovy
@@ -70,7 +70,7 @@
                     #!/usr/bin/env bash
 
                     cd ${params.project}
-                    if [ ! -Z ${params.ghprbPullId} ]
+                    if [ ! -z ${params.ghprbPullId} ]
                     then
                       git checkout FETCH_HEAD
                     else