diff --git a/querydsl-core/src/main/java/com/querydsl/core/support/ExtendedSubQuery.java b/querydsl-core/src/main/java/com/querydsl/core/support/ExtendedSubQuery.java
index 22ab19210..6afb50b1f 100644
--- a/querydsl-core/src/main/java/com/querydsl/core/support/ExtendedSubQuery.java
+++ b/querydsl-core/src/main/java/com/querydsl/core/support/ExtendedSubQuery.java
@@ -16,6 +16,7 @@ package com.querydsl.core.support;
 import com.querydsl.core.types.Expression;
 import com.querydsl.core.types.SubQueryExpression;
 import com.querydsl.core.types.dsl.BooleanExpression;
+import com.querydsl.core.types.dsl.BooleanOperation;
 
 /**
  * {@code ExtendedSubQuery} extends the {@link SubQueryExpression} interface to provide fluent
@@ -151,4 +152,18 @@ public interface ExtendedSubQuery<T> extends SubQueryExpression<T> {
      */
     BooleanExpression goe(T constant);
 
+    /**
+     * Create a {@code this is null} expression
+     *
+     * @return this is null
+     */
+     BooleanOperation isNull();
+
+    /**
+     * Create a {@code this is not null} expression
+     *
+     * @return this is not null
+     */
+     BooleanOperation isNotNull();
+
 }
diff --git a/querydsl-core/src/main/java/com/querydsl/core/support/FetchableSubQueryBase.java b/querydsl-core/src/main/java/com/querydsl/core/support/FetchableSubQueryBase.java
index 20056cc0f..6d84ebb23 100644
--- a/querydsl-core/src/main/java/com/querydsl/core/support/FetchableSubQueryBase.java
+++ b/querydsl-core/src/main/java/com/querydsl/core/support/FetchableSubQueryBase.java
@@ -16,6 +16,7 @@ package com.querydsl.core.support;
 import com.querydsl.core.QueryMetadata;
 import com.querydsl.core.types.*;
 import com.querydsl.core.types.dsl.BooleanExpression;
+import com.querydsl.core.types.dsl.BooleanOperation;
 import com.querydsl.core.types.dsl.Expressions;
 
 /**
@@ -121,6 +122,16 @@ public abstract class FetchableSubQueryBase<T, Q extends FetchableSubQueryBase<T
         return goe(Expressions.constant(constant));
     }
 
+    @Override
+    public BooleanOperation isNull() {
+        return Expressions.booleanOperation(Ops.IS_NULL, mixin);
+    }
+
+    @Override
+    public BooleanOperation isNotNull() {
+        return Expressions.booleanOperation(Ops.IS_NOT_NULL, mixin);
+    }
+
     @Override
     public final int hashCode() {
         return mixin.hashCode();