diff --git a/exist-core/src/main/java/org/exist/xquery/functions/fn/FunExactlyOne.java b/exist-core/src/main/java/org/exist/xquery/functions/fn/FunExactlyOne.java
index 2eea72faab9..588f0b47206 100644
--- a/exist-core/src/main/java/org/exist/xquery/functions/fn/FunExactlyOne.java
+++ b/exist-core/src/main/java/org/exist/xquery/functions/fn/FunExactlyOne.java
@@ -79,7 +79,7 @@ public Sequence eval(Sequence contextSequence, Item contextItem) throws XPathExc
 			if (LOG.isTraceEnabled()) {
                 logger.trace("fn:exactly-one called with a sequence containing {} items", result.getItemCount());
 			}
-			throw new XPathException(this, ErrorCodes.FOCA0005, "fn:exactly-one called with a sequence containing " + result.getItemCount() + " items", result);
+			throw new XPathException(this, ErrorCodes.FORG0005, "fn:exactly-one called with a sequence containing " + result.getItemCount() + " items", result);
         }
 
         if (context.getProfiler().isEnabled())