diff --git a/internal/domain/history.go b/internal/domain/history.go
index 1e34b25..ab35de9 100644
--- a/internal/domain/history.go
+++ b/internal/domain/history.go
@@ -10,8 +10,8 @@ type History struct {
 }
 
 type Institution struct {
-	ID        int64  `json:"id"`
-	Name      string `json:"name"`
-	ShortName string `json:"short_name"`
-	Created   int64  `json:"created"`
+	ID        int64  `json:"id,omitempty"`
+	Name      string `json:"name,omitempty"`
+	ShortName string `json:"short_name,omitempty"`
+	Created   int64  `json:"created,omitempty"`
 }