diff --git a/dbrepo-metadata-db/api/src/main/java/at/tuwien/api/identifier/IdentifierCreateDto.java b/dbrepo-metadata-db/api/src/main/java/at/tuwien/api/identifier/IdentifierCreateDto.java
index b96f66006e9d54f0705aa6b25a55ae89601f8fd6..67a9e858e95b8dc72b9074870de4e697346e72f8 100644
--- a/dbrepo-metadata-db/api/src/main/java/at/tuwien/api/identifier/IdentifierCreateDto.java
+++ b/dbrepo-metadata-db/api/src/main/java/at/tuwien/api/identifier/IdentifierCreateDto.java
@@ -11,6 +11,7 @@ import lombok.Setter;
 
 import javax.validation.constraints.NotBlank;
 import javax.validation.constraints.NotNull;
+import javax.validation.constraints.NotEmpty;
 import java.util.List;
 
 @Data
@@ -58,6 +59,7 @@ public class IdentifierCreateDto {
     private Integer publicationYear;
 
     @NotNull
+    @NotEmpty
     private List<CreatorCreateDto> creators;
 
     @JsonProperty("related_identifiers")