diff --git a/installer/appx/logging.properties b/installer/appx/logging.properties
index 30276b78..dfe1475b 100644
--- a/installer/appx/logging.properties
+++ b/installer/appx/logging.properties
@@ -9,4 +9,4 @@ java.util.logging.ConsoleHandler.level = WARNING
 java.util.logging.ConsoleHandler.formatter = java.util.logging.SimpleFormatter
 
 # Suppress WindowsPreferences logging
-java.util.prefs = SEVERE
+java.util.prefs.level = SEVERE
diff --git a/installer/msi/logging.properties b/installer/msi/logging.properties
index 30276b78..dfe1475b 100644
--- a/installer/msi/logging.properties
+++ b/installer/msi/logging.properties
@@ -9,4 +9,4 @@ java.util.logging.ConsoleHandler.level = WARNING
 java.util.logging.ConsoleHandler.formatter = java.util.logging.SimpleFormatter
 
 # Suppress WindowsPreferences logging
-java.util.prefs = SEVERE
+java.util.prefs.level = SEVERE