diff --git a/teavm-extras-slf4j/src/main/java/org/teavm/extras/slf4j/LoggerFactoryTransformer.java b/teavm-extras-slf4j/src/main/java/org/teavm/extras/slf4j/LoggerFactoryTransformer.java
index 96b45dabf..c763e66fc 100644
--- a/teavm-extras-slf4j/src/main/java/org/teavm/extras/slf4j/LoggerFactoryTransformer.java
+++ b/teavm-extras-slf4j/src/main/java/org/teavm/extras/slf4j/LoggerFactoryTransformer.java
@@ -15,12 +15,10 @@
  */
 package org.teavm.extras.slf4j;
 
-import org.slf4j.ILoggerFactory;
 import org.slf4j.LoggerFactory;
-import org.slf4j.helpers.SubstituteLoggerFactory;
 import org.teavm.diagnostics.Diagnostics;
 import org.teavm.model.*;
-import org.teavm.model.instructions.*;
+import org.teavm.model.util.ModelUtils;
 
 /**
  *
@@ -32,71 +30,22 @@ public class LoggerFactoryTransformer implements ClassHolderTransformer {
         if (!cls.getName().equals(LoggerFactory.class.getName())) {
             return;
         }
-        addCacheField(cls);
-        modifyClinit(cls);
-        replaceGetFactory(cls);
-        cls.removeField(cls.getField("TEMP_FACTORY"));
+        substitute(cls, innerSource);
     }
 
-    private void addCacheField(ClassHolder cls) {
-        FieldHolder cacheField = new FieldHolder("loggerFactoryCache");
-        cacheField.setLevel(AccessLevel.PRIVATE);
-        cacheField.getModifiers().add(ElementModifier.STATIC);
-        cacheField.setType(ValueType.object(TeaVMLoggerFactory.class.getName()));
-        cls.addField(cacheField);
-    }
-
-    private void modifyClinit(ClassHolder cls) {
-        MethodHolder clinit = cls.getMethod(new MethodDescriptor("<clinit>", void.class));
-        BasicBlock clinitBlock = clinit.getProgram().basicBlockAt(0);
-        Variable factoryVar = clinit.getProgram().createVariable();
-        ConstructInstruction construct = new ConstructInstruction();
-        construct.setType(TeaVMLoggerFactory.class.getName());
-        construct.setReceiver(factoryVar);
-        clinitBlock.getInstructions().add(0, construct);
-        InvokeInstruction init = new InvokeInstruction();
-        init.setInstance(factoryVar);
-        init.setMethod(new MethodReference(TeaVMLoggerFactory.class, "<init>", void.class));
-        init.setType(InvocationType.SPECIAL);
-        clinitBlock.getInstructions().add(1, init);
-        PutFieldInstruction put = new PutFieldInstruction();
-        put.setValue(factoryVar);
-        put.setField(new FieldReference(LoggerFactory.class.getName(), "loggerFactoryCache"));
-        clinitBlock.getInstructions().add(2, put);
-
-        Program program = clinit.getProgram();
-        for (int i = 0; i < program.basicBlockCount(); ++i) {
-            BasicBlock block = program.basicBlockAt(i);
-            for (int j = 0; j < block.getInstructions().size(); ++j) {
-                Instruction insn = block.getInstructions().get(j);
-                if (insn instanceof InvokeInstruction) {
-                    InvokeInstruction invoke = (InvokeInstruction)insn;
-                    if (invoke.getMethod().getClassName().equals(SubstituteLoggerFactory.class.getName())) {
-                        block.getInstructions().set(j, new EmptyInstruction());
-                    }
-                } else if (insn instanceof PutFieldInstruction) {
-                    PutFieldInstruction putField = (PutFieldInstruction)insn;
-                    if (putField.getField().getFieldName().equals("TEMP_FACTORY")) {
-                        block.getInstructions().set(j, new EmptyInstruction());
-                    }
-                }
-            }
+    private void substitute(ClassHolder cls, ClassReaderSource classSource) {
+        ClassReader subst = classSource.get(TeaVMLoggerFactorySubstitution.class.getName());
+        for (FieldHolder field : cls.getFields().toArray(new FieldHolder[0])) {
+            cls.removeField(field);
+        }
+        for (MethodHolder method : cls.getMethods().toArray(new MethodHolder[0])) {
+            cls.removeMethod(method);
+        }
+        for (FieldReader field : subst.getFields()) {
+            cls.addField(ModelUtils.copyField(field));
+        }
+        for (MethodReader method : subst.getMethods()) {
+            cls.addMethod(ModelUtils.copyMethod(method));
         }
     }
-
-    private void replaceGetFactory(ClassHolder cls) {
-        MethodHolder method = cls.getMethod(new MethodDescriptor("getILoggerFactory", ILoggerFactory.class));
-        Program program = new Program();
-        BasicBlock block = program.createBasicBlock();
-        Variable cacheVar = program.createVariable();
-        GetFieldInstruction get = new GetFieldInstruction();
-        get.setField(new FieldReference(LoggerFactory.class.getName(), "loggerFactoryCache"));
-        get.setFieldType(ValueType.object(ILoggerFactory.class.getName()));
-        get.setReceiver(cacheVar);
-        block.getInstructions().add(get);
-        ExitInstruction exit = new ExitInstruction();
-        exit.setValueToReturn(cacheVar);
-        block.getInstructions().add(exit);
-        method.setProgram(program);
-    }
 }
diff --git a/teavm-extras-slf4j/src/main/java/org/teavm/extras/slf4j/TeaVMLoggerFactorySubstitution.java b/teavm-extras-slf4j/src/main/java/org/teavm/extras/slf4j/TeaVMLoggerFactorySubstitution.java
new file mode 100644
index 000000000..fa94f58ed
--- /dev/null
+++ b/teavm-extras-slf4j/src/main/java/org/teavm/extras/slf4j/TeaVMLoggerFactorySubstitution.java
@@ -0,0 +1,50 @@
+/*
+ *  Copyright 2015 Alexey Andreev.
+ *
+ *  Licensed under the Apache License, Version 2.0 (the "License");
+ *  you may not use this file except in compliance with the License.
+ *  You may obtain a copy of the License at
+ *
+ *       http://www.apache.org/licenses/LICENSE-2.0
+ *
+ *  Unless required by applicable law or agreed to in writing, software
+ *  distributed under the License is distributed on an "AS IS" BASIS,
+ *  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ *  See the License for the specific language governing permissions and
+ *  limitations under the License.
+ */
+package org.teavm.extras.slf4j;
+
+import java.util.HashMap;
+import java.util.Map;
+import org.slf4j.ILoggerFactory;
+import org.slf4j.Logger;
+
+/**
+ *
+ * @author Alexey Andreev
+ */
+public final class TeaVMLoggerFactorySubstitution {
+    private static Map<String, TeaVMLogger> loggers = new HashMap<>();
+    private static TeaVMLoggerFactory loggerFactory = new TeaVMLoggerFactory();
+
+    private TeaVMLoggerFactorySubstitution() {
+    }
+
+    public static Logger getLogger(String name) {
+        TeaVMLogger logger = loggers.get(name);
+        if (logger == null) {
+            logger = new TeaVMLogger(name);
+            loggers.put(name, logger);
+        }
+        return logger;
+    }
+
+    public static Logger getLogger(Class<?> clazz) {
+        return getLogger(clazz.getName());
+    }
+
+    public static ILoggerFactory getILoggerFactory() {
+        return loggerFactory;
+    }
+}