diff --git a/configuration/sample-development.engine.ini b/configuration/sample-development.engine.ini
index b8a22c9c07e54ded6f72fe1ff89c5b7065fab882..56c39868651d924a69d844efd5d4d97cfebe3a41 100644
--- a/configuration/sample-development.engine.ini
+++ b/configuration/sample-development.engine.ini
@@ -33,7 +33,7 @@ from_mail="monitoring@aura.engine"
 # The beginning of the subject. With that you can easily apply filter rules using a mail client
 mailsubject_prefix="[Aura Engine]"
 # Server where heartbeat info is sent to
-hearbeat_server = '127.0.0.1'   
+heartbeat_server = "127.0.0.1"   
 # Some UDP port
 heartbeat_port = 43334 
 # Seconds how often the vitality of the Engine should be checked (0 = disabled)
diff --git a/configuration/sample-docker.engine.ini b/configuration/sample-docker.engine.ini
index cd5639cc44133d35e7e4798569932c33c8b4f1b7..47524e12147699ffbc99c866afacc5b9c42c7120 100644
--- a/configuration/sample-docker.engine.ini
+++ b/configuration/sample-docker.engine.ini
@@ -33,7 +33,7 @@ from_mail="monitoring@aura.engine"
 # The beginning of the subject. With that you can easily apply filter rules using a mail client
 mailsubject_prefix="[Aura Engine]"
 # Server where heartbeat info is sent to
-hearbeat_server = '172.17.0.1'   
+heartbeat_server = "127.0.0.1"
 # Some UDP port
 heartbeat_port = 43334 
 # Seconds how often the vitality of the Engine should be checked (0 = disabled)
diff --git a/configuration/sample-production.engine.ini b/configuration/sample-production.engine.ini
index c767a1b946ee7365aa6442b3f3050079504c61b0..a7062bac9270fbc15e2b92d65512ff53614348b6 100644
--- a/configuration/sample-production.engine.ini
+++ b/configuration/sample-production.engine.ini
@@ -33,7 +33,7 @@ from_mail="monitoring@aura.engine"
 # The beginning of the subject. With that you can easily apply filter rules using a mail client
 mailsubject_prefix="[Aura Engine]"
 # Server where heartbeat info is sent to
-hearbeat_server = '127.0.0.1'   
+heartbeat_server = "127.0.0.1"
 # Some UDP port
 heartbeat_port = 43334 
 # Seconds how often the vitality of the Engine should be checked (0 = disabled)