diff --git a/api/models/v1_server_capacity.go b/api/models/v1_server_capacity.go
index 103fffa..4104f38 100644
--- a/api/models/v1_server_capacity.go
+++ b/api/models/v1_server_capacity.go
@@ -55,9 +55,9 @@ type V1ServerCapacity struct {
 	// Required: true
 	Total *int32 `json:"total" yaml:"total"`
 
-	// the amount of unused reservations for this size
+	// the amount of used reservations for this size
 	// Required: true
-	Unusedreservations *int32 `json:"unusedreservations" yaml:"unusedreservations"`
+	Usedreservations *int32 `json:"usedreservations" yaml:"usedreservations"`
 }
 
 // Validate validates this v1 server capacity
@@ -100,7 +100,7 @@ func (m *V1ServerCapacity) Validate(formats strfmt.Registry) error {
 		res = append(res, err)
 	}
 
-	if err := m.validateUnusedreservations(formats); err != nil {
+	if err := m.validateUsedreservations(formats); err != nil {
 		res = append(res, err)
 	}
 
@@ -191,9 +191,9 @@ func (m *V1ServerCapacity) validateTotal(formats strfmt.Registry) error {
 	return nil
 }
 
-func (m *V1ServerCapacity) validateUnusedreservations(formats strfmt.Registry) error {
+func (m *V1ServerCapacity) validateUsedreservations(formats strfmt.Registry) error {
 
-	if err := validate.Required("unusedreservations", "body", m.Unusedreservations); err != nil {
+	if err := validate.Required("usedreservations", "body", m.Usedreservations); err != nil {
 		return err
 	}
 
diff --git a/metal-api.json b/metal-api.json
index d5fc508..e1dec32 100644
--- a/metal-api.json
+++ b/metal-api.json
@@ -4262,8 +4262,8 @@
           "format": "int32",
           "type": "integer"
         },
-        "unusedreservations": {
-          "description": "the amount of unused reservations for this size",
+        "usedreservations": {
+          "description": "the amount of used reservations for this size",
           "format": "int32",
           "type": "integer"
         }
@@ -4278,7 +4278,7 @@
         "reservations",
         "size",
         "total",
-        "unusedreservations"
+        "usedreservations"
       ]
     },
     "v1.SizeConstraint": {