diff --git a/querydsl-core/src/main/java/com/querydsl/core/types/ConstantImpl.java b/querydsl-core/src/main/java/com/querydsl/core/types/ConstantImpl.java
index 9f2b3b930..381ce6aed 100644
--- a/querydsl-core/src/main/java/com/querydsl/core/types/ConstantImpl.java
+++ b/querydsl-core/src/main/java/com/querydsl/core/types/ConstantImpl.java
@@ -104,6 +104,10 @@ public final class ConstantImpl<T> extends ExpressionBase<T> implements Constant
         return new ConstantImpl<T>(obj);
     }
 
+    public static <T> Constant<T> create(Class<T> type, T constant) {
+        return new ConstantImpl<T>(type, constant);
+    }
+
     private final T constant;
 
     /**
@@ -112,7 +116,7 @@ public final class ConstantImpl<T> extends ExpressionBase<T> implements Constant
      * @param constant constant
      */
     @SuppressWarnings("unchecked") //The class of the constant will mandate the type
-    public ConstantImpl(T constant) {
+    private ConstantImpl(T constant) {
         this((Class)constant.getClass(), constant);
     }
 
@@ -122,7 +126,7 @@ public final class ConstantImpl<T> extends ExpressionBase<T> implements Constant
      * @param type type of the expression
      * @param constant constant
      */
-    public ConstantImpl(Class<T> type, T constant) {
+    private ConstantImpl(Class<T> type, T constant) {
         super(type);
         this.constant = constant;
     }
diff --git a/querydsl-scala/src/main/scala/com/querydsl/scala/Expressions.scala b/querydsl-scala/src/main/scala/com/querydsl/scala/Expressions.scala
index 381572f52..39ccb6457 100644
--- a/querydsl-scala/src/main/scala/com/querydsl/scala/Expressions.scala
+++ b/querydsl-scala/src/main/scala/com/querydsl/scala/Expressions.scala
@@ -28,7 +28,7 @@ object Constants {
 
   def constant(value: String) = ConstantImpl.create(value)
 
-  def constant[T](value: T) = new ConstantImpl(value)
+  def constant[T](value: T) = ConstantImpl.create(value)
 
 }
 
diff --git a/querydsl-sql/src/main/java/com/querydsl/sql/SQLExpressions.java b/querydsl-sql/src/main/java/com/querydsl/sql/SQLExpressions.java
index 45b57f531..7951bcbff 100644
--- a/querydsl-sql/src/main/java/com/querydsl/sql/SQLExpressions.java
+++ b/querydsl-sql/src/main/java/com/querydsl/sql/SQLExpressions.java
@@ -641,7 +641,7 @@ public final class SQLExpressions {
      * @return nth_value(expr, n)
      */
     public static <T> WindowOver<T> nthValue(Expression<T> expr, Number n) {
-        return nthValue(expr, new ConstantImpl<Number>(n));
+        return nthValue(expr, ConstantImpl.create(n));
     }
 
     /**
@@ -664,7 +664,7 @@ public final class SQLExpressions {
      * @return ntile(num)
      */
     public static <T extends Number & Comparable> WindowOver<T> ntile(T num) {
-        return new WindowOver<T>((Class<T>)num.getClass(), SQLOps.NTILE, new ConstantImpl<T>(num));
+        return new WindowOver<T>((Class<T>)num.getClass(), SQLOps.NTILE, ConstantImpl.create(num));
     }
 
     /**
@@ -800,7 +800,7 @@ public final class SQLExpressions {
         if (arg.doubleValue() < 0.0 || arg.doubleValue() > 1.0) {
             throw new IllegalArgumentException("The percentile value should be a number between 0 and 1");
         }
-        return percentileCont(new ConstantImpl<T>(arg));
+        return percentileCont(ConstantImpl.create(arg));
     }
 
     /**
@@ -829,7 +829,7 @@ public final class SQLExpressions {
         if (arg.doubleValue() < 0.0 || arg.doubleValue() > 1.0) {
             throw new IllegalArgumentException("The percentile value should be a number between 0 and 1");
         }
-        return percentileDisc(new ConstantImpl<T>(arg));
+        return percentileDisc(ConstantImpl.create(arg));
     }
 
     /**