diff --git a/pgjdbc/src/main/java/org/postgresql/PGConnection.java b/pgjdbc/src/main/java/org/postgresql/PGConnection.java
index ba2a04e907..021d1909cc 100644
--- a/pgjdbc/src/main/java/org/postgresql/PGConnection.java
+++ b/pgjdbc/src/main/java/org/postgresql/PGConnection.java
@@ -182,6 +182,11 @@ public interface PGConnection {
    */
   int getBackendPID();
 
+  /**
+   * Sends a query cancellation for this connection.
+   */
+  void cancelQuery() throws SQLException;
+
   /**
    * Return the given string suitably quoted to be used as an identifier in an SQL statement string.
    * Quotes are added only if necessary (i.e., if the string contains non-identifier characters or