diff --git a/flatlaf-core/src/main/java/com/formdev/flatlaf/UIDefaultsLoader.java b/flatlaf-core/src/main/java/com/formdev/flatlaf/UIDefaultsLoader.java
index d1303d48..8b47e1d0 100644
--- a/flatlaf-core/src/main/java/com/formdev/flatlaf/UIDefaultsLoader.java
+++ b/flatlaf-core/src/main/java/com/formdev/flatlaf/UIDefaultsLoader.java
@@ -109,6 +109,14 @@ class UIDefaultsLoader
 				}
 			}
 
+			// collect addon class loaders
+			List<ClassLoader> addonClassLoaders = new ArrayList<>();
+			for( FlatDefaultsAddon addon : addons ) {
+				ClassLoader addonClassLoader = addon.getClass().getClassLoader();
+				if( !addonClassLoaders.contains( addonClassLoader ) )
+					addonClassLoaders.add( addonClassLoader );
+			}
+
 			// load custom properties files (usually provides by applications)
 			List<Object> customDefaultsSources = FlatLaf.getCustomDefaultsSources();
 			int size = (customDefaultsSources != null) ? customDefaultsSources.size() : 0;
@@ -119,6 +127,10 @@ class UIDefaultsLoader
 					String packageName = (String) source;
 					ClassLoader classLoader = (ClassLoader) customDefaultsSources.get( ++i );
 
+					// use class loader also for instantiating classes specified in values
+					if( classLoader != null && !addonClassLoaders.contains( classLoader ) )
+						addonClassLoaders.add( classLoader );
+
 					packageName = packageName.replace( '.', '/' );
 					if( classLoader == null )
 						classLoader = FlatLaf.class.getClassLoader();
@@ -145,14 +157,6 @@ class UIDefaultsLoader
 				}
 			}
 
-			// collect addon class loaders
-			List<ClassLoader> addonClassLoaders = new ArrayList<>();
-			for( FlatDefaultsAddon addon : addons ) {
-				ClassLoader addonClassLoader = addon.getClass().getClassLoader();
-				if( !addonClassLoaders.contains( addonClassLoader ) )
-					addonClassLoaders.add( addonClassLoader );
-			}
-
 			// add additional defaults
 			if( additionalDefaults != null )
 				properties.putAll( additionalDefaults );