diff --git a/test/groovy/MTABuildTest.groovy b/test/groovy/MTABuildTest.groovy
index 9c20aa8a8..abc0bc690 100644
--- a/test/groovy/MTABuildTest.groovy
+++ b/test/groovy/MTABuildTest.groovy
@@ -84,8 +84,7 @@ public class MTABuildTest extends BasePipelineTest {
         def script = loadScript(pipeline)
         def mtarFilePath = script.execute()
 
-        assert shellCalls[0].startsWith('sed -ie \"s/\\\${timestamp}/`date +%Y%m%d%H%M%S`/g\" ')
-        assert shellCalls[0].endsWith('/mta.yaml')
+        assert shellCalls[0] =~ /sed -ie "s\/\\\$\{timestamp\}\/`date \+%Y%m%d%H%M%S`\/g" ".*\/mta.yaml"$/
 
         assert shellCalls[1].contains("PATH=./node_modules/.bin:/usr/bin")
 
@@ -108,8 +107,7 @@ public class MTABuildTest extends BasePipelineTest {
         def script = loadScript(pipeline)
         def mtarFilePath = script.execute()
 
-        assert shellCalls[0].startsWith('sed -ie \"s/\\\${timestamp}/`date +%Y%m%d%H%M%S`/g\" ')
-        assert shellCalls[0].endsWith('/mta.yaml')
+        assert shellCalls[0] =~ /sed -ie "s\/\\\$\{timestamp\}\/`date \+%Y%m%d%H%M%S`\/g" ".*\/mta.yaml"$/
 
         assert shellCalls[1].contains("PATH=./node_modules/.bin:/usr/bin")
 
@@ -134,8 +132,7 @@ public class MTABuildTest extends BasePipelineTest {
         def script = loadScript(pipeline)
         def mtarFilePath = script.execute(newDirName)
 
-        assert shellCalls[0].startsWith('sed -ie \"s/\\\${timestamp}/`date +%Y%m%d%H%M%S`/g\" ')
-        assert shellCalls[0].endsWith('/mta.yaml')
+        assert shellCalls[0] =~ /sed -ie "s\/\\\$\{timestamp\}\/`date \+%Y%m%d%H%M%S`\/g" ".*\/newDir\/mta.yaml"$/
 
         assert shellCalls[1].contains("PATH=./node_modules/.bin:/usr/bin")
 
@@ -155,8 +152,7 @@ public class MTABuildTest extends BasePipelineTest {
         def script = loadScript(pipeline)
         def mtarFilePath = script.execute()
 
-        assert shellCalls[0].startsWith('sed -ie \"s/\\\${timestamp}/`date +%Y%m%d%H%M%S`/g\" ')
-        assert shellCalls[0].endsWith('/mta.yaml')
+        assert shellCalls[0] =~ /sed -ie "s\/\\\$\{timestamp\}\/`date \+%Y%m%d%H%M%S`\/g" ".*\/mta.yaml"$/
 
         assert shellCalls[1].contains("PATH=./node_modules/.bin:/usr/bin")
 
@@ -177,8 +173,7 @@ public class MTABuildTest extends BasePipelineTest {
         def script = loadScript(pipeline)
         def mtarFilePath = script.execute()
 
-        assert shellCalls[0].startsWith('sed -ie \"s/\\\${timestamp}/`date +%Y%m%d%H%M%S`/g\" ')
-        assert shellCalls[0].endsWith('/mta.yaml')
+        assert shellCalls[0] =~ /sed -ie "s\/\\\$\{timestamp\}\/`date \+%Y%m%d%H%M%S`\/g" ".*\/mta.yaml"$/
 
         assert shellCalls[1].contains("PATH=./node_modules/.bin:/usr/bin")
 
diff --git a/vars/mtaBuild.groovy b/vars/mtaBuild.groovy
index 7e9aff071..ccaaad2ca 100644
--- a/vars/mtaBuild.groovy
+++ b/vars/mtaBuild.groovy
@@ -20,7 +20,7 @@ def call(Map parameters = [:]) {
         def mtaYaml = readYaml file: "${pwd()}/mta.yaml"
 
         //[Q]: Why not yaml.dump()? [A]: This reformats the whole file.
-        sh "sed -ie \"s/\\\${timestamp}/`date +%Y%m%d%H%M%S`/g\" ${pwd()}/mta.yaml"
+        sh "sed -ie \"s/\\\${timestamp}/`date +%Y%m%d%H%M%S`/g\" \"${pwd()}/mta.yaml\""
 
         def id = mtaYaml.ID
         if (!id) {