diff --git a/teavm-html4j/pom.xml b/teavm-html4j/pom.xml
index 64f1472d9..78f588056 100644
--- a/teavm-html4j/pom.xml
+++ b/teavm-html4j/pom.xml
@@ -101,6 +101,9 @@
               <debugInformationGenerated>true</debugInformationGenerated>
               <sourceMapsGenerated>true</sourceMapsGenerated>
               <sourceFilesCopied>true</sourceFilesCopied>
+              <additionalScripts>
+                
+              </additionalScripts>
             </configuration>
           </execution>
         </executions>
diff --git a/teavm-html4j/src/main/java/org/teavm/html4j/JavaScriptBodyGenerator.java b/teavm-html4j/src/main/java/org/teavm/html4j/JavaScriptBodyGenerator.java
index 50fb1e828..12e1222b0 100644
--- a/teavm-html4j/src/main/java/org/teavm/html4j/JavaScriptBodyGenerator.java
+++ b/teavm-html4j/src/main/java/org/teavm/html4j/JavaScriptBodyGenerator.java
@@ -106,9 +106,10 @@ public class JavaScriptBodyGenerator implements Generator {
                 if (i > 0) {
                     sb.append(", ");
                 }
+                ValueType paramType = simplifyParamType(reader.parameterType(i));
                 sb.append(naming.getFullNameFor(JavaScriptConvGenerator.fromJsMethod)).append("(p").append(i)
                         .append(", ")
-                        .append(Renderer.typeToClsString(naming, reader.parameterType(i))).append(")");
+                        .append(Renderer.typeToClsString(naming, paramType)).append(")");
             }
             sb.append(")); })(");
             if (ident != null) {
@@ -116,6 +117,16 @@ public class JavaScriptBodyGenerator implements Generator {
             }
             return sb.toString();
         }
+        private ValueType simplifyParamType(ValueType type) {
+            if (type instanceof ValueType.Object) {
+                return ValueType.object("java.lang.Object");
+            } else if (type instanceof ValueType.Array) {
+                ValueType.Array array = (ValueType.Array)type;
+                return ValueType.arrayOf(simplifyParamType(array.getItemType()));
+            } else {
+                return type;
+            }
+        }
         private MethodReader findMethod(String clsName, MethodDescriptor desc) {
             while (clsName != null) {
                 ClassReader cls = classSource.get(clsName);
diff --git a/teavm-html4j/src/test/java/org/teavm/html4j/test/Callback.java b/teavm-html4j/src/test/java/org/teavm/html4j/test/Callback.java
new file mode 100644
index 000000000..0b58916e2
--- /dev/null
+++ b/teavm-html4j/src/test/java/org/teavm/html4j/test/Callback.java
@@ -0,0 +1,11 @@
+package org.teavm.html4j.test;
+
+import java.util.Calendar;
+
+/**
+ *
+ * @author Alexey Andreev
+ */
+public interface Callback {
+    void exec(Calendar input);
+}
diff --git a/teavm-html4j/src/test/java/org/teavm/html4j/test/JavaScriptBodyTest.java b/teavm-html4j/src/test/java/org/teavm/html4j/test/JavaScriptBodyTest.java
index a3dce3b5d..6374dd80f 100644
--- a/teavm-html4j/src/test/java/org/teavm/html4j/test/JavaScriptBodyTest.java
+++ b/teavm-html4j/src/test/java/org/teavm/html4j/test/JavaScriptBodyTest.java
@@ -16,6 +16,7 @@
 package org.teavm.html4j.test;
 
 import static org.junit.Assert.assertEquals;
+import java.util.Calendar;
 import net.java.html.js.JavaScriptBody;
 import org.junit.Test;
 
@@ -60,6 +61,18 @@ public class JavaScriptBodyTest {
         assertEquals(23, invokeStaticCallback(new AImpl()));
     }
 
+    @Test
+    public void unusedArgumentIgnored() {
+        final int[] array = new int[1];
+        invokeCallback(new Callback() {
+            @Override
+            public void exec(Calendar input) {
+                array[0] = 23;
+            }
+        });
+        assertEquals(23, array[0]);
+    }
+
     private static class AImpl implements A {
         @Override public int foo() {
             return 23;
@@ -95,4 +108,8 @@ public class JavaScriptBodyTest {
             "@org.teavm.html4j.test.JavaScriptBodyTest::staticCallback(" +
             "Lorg/teavm/html4j/test/A;)(a)", javacall = true)
     private native int invokeStaticCallback(A a);
+
+    @JavaScriptBody(args = "callback", body = "callback.@org.teavm.html4j.test.Callback::exec(" +
+            "Ljava/util/Calendar;)(null)", javacall = true)
+    private native void invokeCallback(Callback callback);
 }