diff --git a/accesscontroltool-bundle/src/main/java/biz/netcentric/cq/tools/actool/impl/AcInstallationServiceImpl.java b/accesscontroltool-bundle/src/main/java/biz/netcentric/cq/tools/actool/impl/AcInstallationServiceImpl.java
index 1448187e..d63e3bb7 100644
--- a/accesscontroltool-bundle/src/main/java/biz/netcentric/cq/tools/actool/impl/AcInstallationServiceImpl.java
+++ b/accesscontroltool-bundle/src/main/java/biz/netcentric/cq/tools/actool/impl/AcInstallationServiceImpl.java
@@ -230,7 +230,7 @@ public JobExecutionResult process(Job job, JobExecutionContext context) {
         boolean isLogVerbose = Boolean.parseBoolean(jobProperties.getOrDefault(JOB_PROPERTY_IS_LOG_VERBOSE, "false").toString());
         asyncInstallLog.attachMessageListener((logLevel, message) -> {
             if (isLogVerbose || logLevel != InstallationLogLevel.TRACE) {
-                context.log(logLevel.toString() + ": " + message);
+                context.log(quoteForMessageFormat(logLevel.toString() + ": " + message));
             }
         });
         asyncInstallLog.attachFinishListener(isSuccess -> 
@@ -255,6 +255,14 @@ public JobExecutionResult process(Job job, JobExecutionContext context) {
         return result;
     }
 
+    /**
+     * Quotes the given string so that it can be safely used as literal argument to {@link java.text.MessageFormat} without being interpreted
+     * @return the quoted string
+     */
+    static String quoteForMessageFormat(String text) {
+        return "'" + text.replace("'", "''") + "'";
+    }
+ 
     @Override
     public boolean attachLogListener(String jobId, BiConsumer<InstallationLogLevel, String> messageListener, Consumer<Boolean> finishListener) {
         return false;
diff --git a/accesscontroltool-bundle/src/test/java/biz/netcentric/cq/tools/actool/impl/AcInstallationServiceImplTest.java b/accesscontroltool-bundle/src/test/java/biz/netcentric/cq/tools/actool/impl/AcInstallationServiceImplTest.java
index b4ccc136..fdb474c4 100644
--- a/accesscontroltool-bundle/src/test/java/biz/netcentric/cq/tools/actool/impl/AcInstallationServiceImplTest.java
+++ b/accesscontroltool-bundle/src/test/java/biz/netcentric/cq/tools/actool/impl/AcInstallationServiceImplTest.java
@@ -19,11 +19,13 @@
 import static org.junit.jupiter.api.Assertions.assertTrue;
 import static org.mockito.Mockito.when;
 
+import java.text.MessageFormat;
 import java.util.Arrays;
 import java.util.HashMap;
 import java.util.Iterator;
 import java.util.List;
 import java.util.Map;
+import java.util.function.UnaryOperator;
 
 import javax.jcr.RepositoryException;
 
@@ -180,4 +182,16 @@ public Object answer(InvocationOnMock invocation) throws Throwable {
         AcInstallationServiceImpl acInstallationServiceImpl2 = new AcInstallationServiceImpl();
         acInstallationServiceImpl2.process(job, jobContext);
     }
+
+    @Test
+    void testQuoteForMessageFormat() {
+        assertQuotedTextForMessageFormat("dev=d 19:41:29.927: Global DEF Statement: ENV_KEY_MAPPING={dev=d, stage=s, int=i, prod=p} 19:41:29.928: ", AcInstallationServiceImpl::quoteForMessageFormat);
+        assertQuotedTextForMessageFormat("This is a test' with apostrophe and {0} braces", AcInstallationServiceImpl::quoteForMessageFormat);
+    }
+
+    static void assertQuotedTextForMessageFormat(String text, UnaryOperator<String> quoteFunction) {
+        String quotedText = quoteFunction.apply(text);
+        String output = MessageFormat.format(quotedText, new Object[0]);
+        assertEquals(text, output);
+    }
 }