diff --git a/teavm-jso/pom.xml b/teavm-jso/pom.xml
index 5e7e7a986..a42c91397 100644
--- a/teavm-jso/pom.xml
+++ b/teavm-jso/pom.xml
@@ -34,10 +34,51 @@ xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xs
       <version>${project.version}</version>
       <optional>true</optional>
     </dependency>
+    <dependency>
+      <groupId>junit</groupId>
+      <artifactId>junit</artifactId>
+      <scope>test</scope>
+    </dependency>
   </dependencies>
 
   <build>
     <plugins>
+      <plugin>
+        <groupId>org.teavm</groupId>
+        <artifactId>teavm-maven-plugin</artifactId>
+        <version>${project.version}</version>
+        <dependencies>
+          <dependency>
+            <groupId>org.teavm</groupId>
+            <artifactId>teavm-classlib</artifactId>
+            <version>${project.version}</version>
+          </dependency>
+        </dependencies>
+        <executions>
+          <execution>
+            <id>generate-javascript-tests</id>
+            <goals>
+              <goal>build-test-javascript</goal>
+            </goals>
+            <phase>process-test-classes</phase>
+            <configuration>
+              <minifying>false</minifying>
+              <properties>
+                <java.util.Locale.available>en, en_US, en_GB, ru, ru_RU</java.util.Locale.available>
+              </properties>
+            </configuration>
+          </execution>
+        </executions>
+      </plugin>
+      <plugin>
+        <groupId>org.apache.maven.plugins</groupId>
+        <artifactId>maven-surefire-plugin</artifactId>
+        <configuration>
+          <excludes>
+            <exclude>**</exclude>
+          </excludes>
+        </configuration>
+      </plugin>
       <plugin>
         <groupId>org.apache.maven.plugins</groupId>
         <artifactId>maven-checkstyle-plugin</artifactId>
diff --git a/teavm-jso/src/main/java/org/teavm/jso/JSNativeGenerator.java b/teavm-jso/src/main/java/org/teavm/jso/JSNativeGenerator.java
index 2e049a44c..9720fb7a6 100644
--- a/teavm-jso/src/main/java/org/teavm/jso/JSNativeGenerator.java
+++ b/teavm-jso/src/main/java/org/teavm/jso/JSNativeGenerator.java
@@ -74,10 +74,10 @@ public class JSNativeGenerator implements Injector, DependencyPlugin {
                 writer.append(')');
                 break;
             case "instantiate":
-                writer.append("(new ");
+                writer.append("(new (");
                 context.writeExpr(context.getArgument(0));
                 renderProperty(context.getArgument(1), context);
-                writer.append('(');
+                writer.append(")(");
                 for (int i = 2; i < context.argumentCount(); ++i) {
                     if (i > 2) {
                         writer.append(',').ws();
diff --git a/teavm-jso/src/test/java/org/teavm/jso/test/JSOTest.java b/teavm-jso/src/test/java/org/teavm/jso/test/JSOTest.java
new file mode 100644
index 000000000..7627d393a
--- /dev/null
+++ b/teavm-jso/src/test/java/org/teavm/jso/test/JSOTest.java
@@ -0,0 +1,21 @@
+package org.teavm.jso.test;
+
+import static org.junit.Assert.*;
+import org.junit.Test;
+import org.teavm.jso.JS;
+
+/**
+ *
+ * @author Alexey Andreev
+ */
+public class JSOTest {
+    @Test
+    public void complexConstructorParenthesized() {
+        RegExp regexp = getWindow().createRegExp(".");
+        assertEquals(".", regexp.getSource());
+    }
+
+    private static Window getWindow() {
+        return (Window)JS.getGlobal();
+    }
+}
diff --git a/teavm-jso/src/test/java/org/teavm/jso/test/RegExp.java b/teavm-jso/src/test/java/org/teavm/jso/test/RegExp.java
new file mode 100644
index 000000000..4ce204f9e
--- /dev/null
+++ b/teavm-jso/src/test/java/org/teavm/jso/test/RegExp.java
@@ -0,0 +1,13 @@
+package org.teavm.jso.test;
+
+import org.teavm.jso.JSObject;
+import org.teavm.jso.JSProperty;
+
+/**
+ *
+ * @author Alexey Andreev
+ */
+public interface RegExp extends JSObject {
+    @JSProperty
+    String getSource();
+}
diff --git a/teavm-jso/src/test/java/org/teavm/jso/test/Window.java b/teavm-jso/src/test/java/org/teavm/jso/test/Window.java
new file mode 100644
index 000000000..04d3bb6a1
--- /dev/null
+++ b/teavm-jso/src/test/java/org/teavm/jso/test/Window.java
@@ -0,0 +1,13 @@
+package org.teavm.jso.test;
+
+import org.teavm.jso.JSConstructor;
+import org.teavm.jso.JSObject;
+
+/**
+ *
+ * @author Alexey Andreev
+ */
+public interface Window extends JSObject {
+    @JSConstructor("RegExp")
+    RegExp createRegExp(String regex);
+}