diff --git a/core/src/main/java/org/teavm/javascript/Renderer.java b/core/src/main/java/org/teavm/javascript/Renderer.java
index f8c218ce4..e9ffad9af 100644
--- a/core/src/main/java/org/teavm/javascript/Renderer.java
+++ b/core/src/main/java/org/teavm/javascript/Renderer.java
@@ -1525,6 +1525,8 @@ public class Renderer implements ExprVisitor, StatementVisitor, RenderingContext
                 case NEGATE:
                     if (outerPrecedence.ordinal() > Precedence.UNARY.ordinal()) {
                         writer.append('(');
+                    } else if (outerPrecedence.ordinal() >= Precedence.ADDITION.ordinal()) {
+                        writer.append(' ');
                     }
                     writer.append("-");
                     precedence = Precedence.UNARY;
@@ -1661,11 +1663,15 @@ public class Renderer implements ExprVisitor, StatementVisitor, RenderingContext
                 pushLocation(expr.getLocation());
             }
             String str = constantToString(expr.getValue());
-            if (str.startsWith("-") && precedence.ordinal() > Precedence.MULTIPLICATION.ordinal()) {
-                writer.append('(');
+            if (str.startsWith("-")) {
+                if (precedence.ordinal() >= Precedence.UNARY.ordinal()) {
+                    writer.append('(');
+                } else {
+                    writer.append(' ');
+                }
             }
             writer.append(str);
-            if (str.startsWith("-") && precedence.ordinal() > Precedence.MULTIPLICATION.ordinal()) {
+            if (str.startsWith("-") && precedence.ordinal() >= Precedence.UNARY.ordinal()) {
                 writer.append(')');
             }
             if (expr.getLocation() != null) {
diff --git a/jso/apis/src/main/java/org/teavm/jso/browser/Window.java b/jso/apis/src/main/java/org/teavm/jso/browser/Window.java
index ba4c8c629..edffaeeeb 100644
--- a/jso/apis/src/main/java/org/teavm/jso/browser/Window.java
+++ b/jso/apis/src/main/java/org/teavm/jso/browser/Window.java
@@ -50,13 +50,13 @@ public abstract class Window implements JSObject, EventTarget, StorageProvider {
     @JSBody(params = { "timeoutId" }, script = "clearTimeout(timeoutId);")
     public static native void clearTimeout(int timeoutId);
 
-    @JSBody(params = { "handler", "delay" }, script = "return setInverval(handler, delay);")
+    @JSBody(params = { "handler", "delay" }, script = "return setInterval(handler, delay);")
     public static native int setInterval(TimerHandler handler, int delay);
 
-    @JSBody(params = { "handler", "delay" }, script = "return setInverval(handler, delay);")
+    @JSBody(params = { "handler", "delay" }, script = "return setInterval(handler, delay);")
     public static native int setInterval(TimerHandler handler, double delay);
 
-    @JSBody(params = { "timeoutId" }, script = "clearInverval(timeoutId);")
+    @JSBody(params = { "timeoutId" }, script = "clearInterval(timeoutId);")
     public static native void clearInterval(int timeoutId);
 
     @JSBody(params = {}, script = "return window;")
diff --git a/jso/apis/src/main/java/org/teavm/jso/typedarrays/ArrayBufferView.java b/jso/apis/src/main/java/org/teavm/jso/typedarrays/ArrayBufferView.java
index 8a1c0e517..2ade2c315 100644
--- a/jso/apis/src/main/java/org/teavm/jso/typedarrays/ArrayBufferView.java
+++ b/jso/apis/src/main/java/org/teavm/jso/typedarrays/ArrayBufferView.java
@@ -23,6 +23,9 @@ import org.teavm.jso.JSProperty;
  * @author Alexey Andreev
  */
 public abstract class ArrayBufferView implements JSObject {
+    private ArrayBufferView() {
+    }
+
     @JSProperty
     public abstract int getLength();