diff --git a/graylog2-server/src/main/java/org/graylog2/indexer/fieldtypes/mapping/FieldTypeMappingsService.java b/graylog2-server/src/main/java/org/graylog2/indexer/fieldtypes/mapping/FieldTypeMappingsService.java
index 390af6507234..a90f5dfebfb8 100644
--- a/graylog2-server/src/main/java/org/graylog2/indexer/fieldtypes/mapping/FieldTypeMappingsService.java
+++ b/graylog2-server/src/main/java/org/graylog2/indexer/fieldtypes/mapping/FieldTypeMappingsService.java
@@ -59,6 +59,7 @@ public void changeFieldType(final CustomFieldMapping customMapping,
                 });
             } catch (Exception ex) {
                 LOG.error("Failed to update field type in index set : " + indexSetId, ex);
+                throw ex;
             }
         }
     }