diff --git a/crnk-core/src/main/java/io/crnk/core/engine/internal/dispatcher/controller/ResourceUpsert.java b/crnk-core/src/main/java/io/crnk/core/engine/internal/dispatcher/controller/ResourceUpsert.java
index 41865e53e..80b374107 100644
--- a/crnk-core/src/main/java/io/crnk/core/engine/internal/dispatcher/controller/ResourceUpsert.java
+++ b/crnk-core/src/main/java/io/crnk/core/engine/internal/dispatcher/controller/ResourceUpsert.java
@@ -155,7 +155,7 @@ private void setAttribute(ResourceInformation resourceInformation, Object instan
 		ResourceField field = resourceInformation.findFieldByJsonName(attributeJsonName, queryContext.getRequestVersion());
 
 		if (field == null && resourceInformation.hasJsonField(attributeJsonName)) {
-			throw new BadRequestException(String.format("attribute %s not available for version {}", attributeJsonName, queryContext.getRequestVersion()));
+			throw new BadRequestException(String.format("attribute %s not available for version %s", attributeJsonName, queryContext.getRequestVersion()));
 		} else if (field != null) {
 			PreconditionUtil.verifyEquals(ResourceFieldType.ATTRIBUTE, field.getResourceFieldType(), "expected %s being an attribute", attributeJsonName);
 		}