diff --git a/debug.xml b/debug.xml
index 15fa57324..29770dfb5 100644
--- a/debug.xml
+++ b/debug.xml
@@ -1,4 +1,4 @@
-<?xml version='1.0' encoding='UTF-8'?>
+<?xml version="1.0" encoding="UTF-8"?>
 <!DOCTYPE properties SYSTEM 'http://java.sun.com/dtd/properties.dtd'>
 <properties>
 
diff --git a/setup/cloud-init.yaml b/setup/cloud-init.yaml
index 3d55f5f6f..734f8e370 100644
--- a/setup/cloud-init.yaml
+++ b/setup/cloud-init.yaml
@@ -2,7 +2,7 @@
 
 write_files:
   - content: |
-      <?xml version='1.0' encoding='UTF-8'?>
+      <?xml version="1.0" encoding="UTF-8"?>
       <!DOCTYPE properties SYSTEM 'http://java.sun.com/dtd/properties.dtd'>
       <properties>
         <entry key='database.driver'>com.mysql.jdbc.Driver</entry>
diff --git a/setup/traccar.xml b/setup/traccar.xml
index d5bd87e9c..2b4518307 100644
--- a/setup/traccar.xml
+++ b/setup/traccar.xml
@@ -1,4 +1,4 @@
-<?xml version='1.0' encoding='UTF-8'?>
+<?xml version="1.0" encoding="UTF-8"?>
 <!DOCTYPE properties SYSTEM 'http://java.sun.com/dtd/properties.dtd'>
 <properties>