diff --git a/sql/postgresql/CSharp/PostgreSQLParserBase.cs b/sql/postgresql/CSharp/PostgreSQLParserBase.cs
index 8c9ef2dcdd..05807415ee 100644
--- a/sql/postgresql/CSharp/PostgreSQLParserBase.cs
+++ b/sql/postgresql/CSharp/PostgreSQLParserBase.cs
@@ -120,4 +120,13 @@ public PostgreSQLParser getPostgreSQLParser(string script)
         parser.AddErrorListener(listener_parser);
         return parser;
     }
+
+    public bool OnlyAcceptableOps()
+    {
+        var c = ((CommonTokenStream)this.InputStream).LT(1);
+        var text = c.Text;
+        return text == "!" || text == "!!"
+            || text == "!=-" // Code for specific example.
+            ;
+    }
 }
diff --git a/sql/postgresql/Java/PostgreSQLParserBase.java b/sql/postgresql/Java/PostgreSQLParserBase.java
index acfb802dfd..660227a4b1 100644
--- a/sql/postgresql/Java/PostgreSQLParserBase.java
+++ b/sql/postgresql/Java/PostgreSQLParserBase.java
@@ -121,4 +121,13 @@ public PostgreSQLParser getPostgreSQLParser(String script) {
         parser.addErrorListener(listener_parser);
         return parser;
     }
+
+    public boolean OnlyAcceptableOps()
+    {
+	var c = ((CommonTokenStream)this.getInputStream()).LT(1);
+	var text = c.getText();
+	return text.equals("!") || text.equals("!!")
+            || text.equals("!=-")
+            ;
+    }
 }
diff --git a/sql/postgresql/PostgreSQLParser.g4 b/sql/postgresql/PostgreSQLParser.g4
index 89a5902750..6b47878051 100644
--- a/sql/postgresql/PostgreSQLParser.g4
+++ b/sql/postgresql/PostgreSQLParser.g4
@@ -3555,7 +3555,7 @@ a_expr
 /*19*/
 
 a_expr_qual
-    : a_expr_lessless qual_op?
+    : a_expr_lessless ({ this.OnlyAcceptableOps() }? qual_op | )
     ;
 
 /*18*/