diff --git a/pkg/loader/openapi.go b/pkg/loader/openapi.go
index 8dd83892..e62fc5ef 100644
--- a/pkg/loader/openapi.go
+++ b/pkg/loader/openapi.go
@@ -305,7 +305,7 @@ func getOpenAPITools(t *openapi3.T, defaultHost, source, targetToolName string)
 					if err != nil {
 						return nil, fmt.Errorf("failed to parse operation server URL: %w", err)
 					}
-					tool.Credentials = info.GetCredentialToolStrings(operationServerURL.Hostname())
+					tool.Credentials = append(tool.Credentials, info.GetCredentialToolStrings(operationServerURL.Hostname())...)
 				}
 			}