diff --git a/gns3server/controller/gns3vm/vmware_gns3_vm.py b/gns3server/controller/gns3vm/vmware_gns3_vm.py
index db3c0543..33085d64 100644
--- a/gns3server/controller/gns3vm/vmware_gns3_vm.py
+++ b/gns3server/controller/gns3vm/vmware_gns3_vm.py
@@ -70,7 +70,7 @@ class VMwareGNS3VM(BaseGNS3VM):
 
         # memory must be a multiple of 4 (VMware requirement)
         if ram % 4 != 0:
-            raise GNS3VMError("Allocated memory for the GNS3 VM must be a multiple of 4".format(available_ram))
+            raise GNS3VMError("Allocated memory {} for the GNS3 VM must be a multiple of 4".format(ram))
 
         available_vcpus = psutil.cpu_count(logical=False)
         if vcpus > available_vcpus: