diff --git a/src/api/java/AST.java b/src/api/java/AST.java
index b7d048a1e..60ff48ecb 100644
--- a/src/api/java/AST.java
+++ b/src/api/java/AST.java
@@ -138,6 +138,14 @@ public class AST extends Z3Object
         }
     }
 
+    /**
+     * Indicates whether the AST is an application
+     **/
+    public boolean IsApp() throws Z3Exception
+    {
+        return this.ASTKind() == Z3_ast_kind.Z3_APP_AST;
+    }
+
     /**
      * Indicates whether the AST is a BoundVariable
      **/
diff --git a/src/api/java/Expr.java b/src/api/java/Expr.java
index a67d94e7e..09456307f 100644
--- a/src/api/java/Expr.java
+++ b/src/api/java/Expr.java
@@ -204,7 +204,7 @@ public class Expr extends AST
 	 **/
 	public boolean IsConst() throws Z3Exception
 	{
-		return IsExpr() && NumArgs() == 0 && FuncDecl().DomainSize() == 0;
+		return IsApp() && NumArgs() == 0 && FuncDecl().DomainSize() == 0;
 	}
 
 	/**