diff --git a/tests/data/test-cookie-invalidation.config b/tests/data/test-cookie-invalidation.config
index 18c730fc..098e9808 100644
--- a/tests/data/test-cookie-invalidation.config
+++ b/tests/data/test-cookie-invalidation.config
@@ -5,7 +5,7 @@
 auth = "plain[./data/test1.passwd]"
 #auth = "pam"
 
-isolate-workers = false
+isolate-workers = @ISOLATE_WORKERS@
 
 # A banner to be displayed on clients
 #banner = "Welcome"
diff --git a/tests/data/test-cookie-timeout-2.config b/tests/data/test-cookie-timeout-2.config
index f82e7a7e..fe216bf5 100644
--- a/tests/data/test-cookie-timeout-2.config
+++ b/tests/data/test-cookie-timeout-2.config
@@ -5,7 +5,7 @@
 auth = "plain[./data/test1.passwd]"
 #auth = "pam"
 
-isolate-workers = false
+isolate-workers = @ISOLATE_WORKERS@
 
 # A banner to be displayed on clients
 #banner = "Welcome"
diff --git a/tests/data/test-cookie-timeout.config b/tests/data/test-cookie-timeout.config
index f82e7a7e..fe216bf5 100644
--- a/tests/data/test-cookie-timeout.config
+++ b/tests/data/test-cookie-timeout.config
@@ -5,7 +5,7 @@
 auth = "plain[./data/test1.passwd]"
 #auth = "pam"
 
-isolate-workers = false
+isolate-workers = @ISOLATE_WORKERS@
 
 # A banner to be displayed on clients
 #banner = "Welcome"
diff --git a/tests/data/test-explicit-ip.config b/tests/data/test-explicit-ip.config
index e2fbcfac..cf362f59 100644
--- a/tests/data/test-explicit-ip.config
+++ b/tests/data/test-explicit-ip.config
@@ -5,7 +5,7 @@
 auth = "plain[./data/test1.passwd]"
 #auth = "pam"
 
-isolate-workers = false
+isolate-workers = @ISOLATE_WORKERS@
 
 # A banner to be displayed on clients
 #banner = "Welcome"
diff --git a/tests/data/test-group-cert.config b/tests/data/test-group-cert.config
index 6c6b624a..bc3d791b 100644
--- a/tests/data/test-group-cert.config
+++ b/tests/data/test-group-cert.config
@@ -5,7 +5,7 @@ auth = "certificate"
 #auth = "plain[./data/test-group.passwd]"
 #auth = "pam"
 
-isolate-workers = false
+isolate-workers = @ISOLATE_WORKERS@
 
 select-group = group1
 select-group = group2
diff --git a/tests/data/test-iroute.config b/tests/data/test-iroute.config
index 87908972..88c68ca4 100644
--- a/tests/data/test-iroute.config
+++ b/tests/data/test-iroute.config
@@ -5,7 +5,7 @@ auth = "certificate"
 #auth = "plain[./data/test1.passwd]"
 #auth = "pam"
 
-isolate-workers = false
+isolate-workers = @ISOLATE_WORKERS@
 
 # A banner to be displayed on clients
 #banner = "Welcome"
diff --git a/tests/data/test-oidc-auth.config b/tests/data/test-oidc-auth.config
index a0137ce6..a0509021 100644
--- a/tests/data/test-oidc-auth.config
+++ b/tests/data/test-oidc-auth.config
@@ -3,7 +3,7 @@
 # Options: certificate, pam. 
 auth = "oidc[config=@SRCDIR@/data/oidc.json]"
 
-isolate-workers = false
+isolate-workers = @ISOLATE_WORKERS@
 
 # A banner to be displayed on clients
 #banner = "Welcome"
diff --git a/tests/data/test-pass-script.config b/tests/data/test-pass-script.config
index 351a5e6e..4afc5135 100644
--- a/tests/data/test-pass-script.config
+++ b/tests/data/test-pass-script.config
@@ -5,7 +5,7 @@
 auth = "plain[./data/test1.passwd]"
 #auth = "pam"
 
-isolate-workers = false
+isolate-workers = @ISOLATE_WORKERS@
 
 # A banner to be displayed on clients
 #banner = "Welcome"
diff --git a/tests/data/test-stress.config b/tests/data/test-stress.config
index 9f0fbd5b..e2c8b4ed 100644
--- a/tests/data/test-stress.config
+++ b/tests/data/test-stress.config
@@ -5,7 +5,7 @@
 auth = "plain[./data/test1.passwd]"
 #auth = "pam"
 
-isolate-workers = false
+isolate-workers = @ISOLATE_WORKERS@
 
 # A banner to be displayed on clients
 #banner = "Welcome"
diff --git a/tests/data/test-user-config.config b/tests/data/test-user-config.config
index 93232c12..91b53e96 100644
--- a/tests/data/test-user-config.config
+++ b/tests/data/test-user-config.config
@@ -5,7 +5,7 @@ auth = "certificate"
 #auth = "plain[./data/test1.passwd]"
 #auth = "pam"
 
-isolate-workers = false
+isolate-workers = @ISOLATE_WORKERS@
 
 # A banner to be displayed on clients
 #banner = "Welcome"