diff --git a/ioctl/cmd/ws/wsdeviceapprove.go b/ioctl/cmd/ws/wsdeviceapprove.go
index d80b13fe6f..529f980e66 100644
--- a/ioctl/cmd/ws/wsdeviceapprove.go
+++ b/ioctl/cmd/ws/wsdeviceapprove.go
@@ -61,7 +61,7 @@ func approveProjectDevice(projectID uint64, devices string) (string, error) {
 		deviceArr = strings.Split(devices, ",")
 	}
 
-	deviceAddress := make([]common.Address, len(deviceArr))
+	deviceAddress := make([]common.Address, 0, len(deviceArr))
 	for _, device := range deviceArr {
 		addr, err := address.FromString(device)
 		if err != nil {
diff --git a/ioctl/cmd/ws/wsdeviceunapprove.go b/ioctl/cmd/ws/wsdeviceunapprove.go
index 850bf98a33..a072f6d504 100644
--- a/ioctl/cmd/ws/wsdeviceunapprove.go
+++ b/ioctl/cmd/ws/wsdeviceunapprove.go
@@ -61,7 +61,7 @@ func unapproveProjectDevice(projectID uint64, devices string) (string, error) {
 		deviceArr = strings.Split(devices, ",")
 	}
 
-	deviceAddress := make([]common.Address, len(deviceArr))
+	deviceAddress := make([]common.Address, 0, len(deviceArr))
 	for _, device := range deviceArr {
 		addr, err := address.FromString(device)
 		if err != nil {