diff --git a/Jenkinsfile b/Jenkinsfile
index 73018bf..1b58e78 100644
--- a/Jenkinsfile
+++ b/Jenkinsfile
@@ -29,7 +29,7 @@ pipeline {
                     params.R6RS_SCHEMES.split().each { SCHEME ->
                         stage("${SCHEME}") {
                             catchError(buildResult: 'SUCCESS', stageResult: 'FAILURE') {
-                                sh "make SCHEME=${SCHEME} test-r6rs-docker"
+                                sh "make SCHEME=${SCHEME} test-r6rs-docker | grep 'scheme-venv-test-success-Hello' || exit 1"
                             }
                         }
                     }
@@ -42,7 +42,7 @@ pipeline {
                     params.R7RS_SCHEMES.split().each { SCHEME ->
                         stage("${SCHEME}") {
                             catchError(buildResult: 'SUCCESS', stageResult: 'FAILURE') {
-                                sh "make SCHEME=${SCHEME} test-r7rs-docker"
+                                sh "make SCHEME=${SCHEME} test-r7rs-docker | grep 'scheme-venv-test-success' || exit 1"
                             }
                         }
                     }
diff --git a/compile-test.scm b/compile-test.scm
index b357b6e..e89eeb1 100644
--- a/compile-test.scm
+++ b/compile-test.scm
@@ -4,6 +4,6 @@
         (retropikzel hello)
         (srfi 64))
 
-(display "Compile test: ")
+(display "scheme-venv-test-success-")
 (hello)
 (exit 0)
diff --git a/compile-test.sps b/compile-test.sps
index 8db451a..2fd5242 100644
--- a/compile-test.sps
+++ b/compile-test.sps
@@ -4,6 +4,6 @@
         (retropikzel hello)
         (srfi :64))
 
-(display "Compile test: ")
+(display "scheme-venv-test-success-")
 (hello)
 (exit 0)
diff --git a/test.scm b/test.scm
index a4bafce..e89eeb1 100644
--- a/test.scm
+++ b/test.scm
@@ -4,6 +4,6 @@
         (retropikzel hello)
         (srfi 64))
 
-(display "Interpreter test: ")
+(display "scheme-venv-test-success-")
 (hello)
 (exit 0)
diff --git a/test.sps b/test.sps
index 9a38099..2fd5242 100644
--- a/test.sps
+++ b/test.sps
@@ -4,6 +4,6 @@
         (retropikzel hello)
         (srfi :64))
 
-(display "Interpreter test: ")
+(display "scheme-venv-test-success-")
 (hello)
 (exit 0)