diff --git a/apis/cloudstack/src/main/java/org/jclouds/cloudstack/domain/VirtualMachine.java b/apis/cloudstack/src/main/java/org/jclouds/cloudstack/domain/VirtualMachine.java
index 675114c577..5e5fee9a57 100644
--- a/apis/cloudstack/src/main/java/org/jclouds/cloudstack/domain/VirtualMachine.java
+++ b/apis/cloudstack/src/main/java/org/jclouds/cloudstack/domain/VirtualMachine.java
@@ -588,7 +588,7 @@ public class VirtualMachine {
                             @Nullable VirtualMachine.State state, @Nullable String templateDisplayText, @Nullable String templateId,
                             @Nullable String templateName, @Nullable String zoneId, @Nullable String zoneName, @Nullable Set<NIC> nics,
                             @Nullable String hypervisor, @Nullable Set<SecurityGroup> securityGroups) {
-      Preconditions.checkArgument(Strings.isNullOrEmpty(cpuUsed) || cpuUsed.matches("^[0-9\\.]+%$"), "cpuUsed value should be a decimal number followed by %");
+      Preconditions.checkArgument(Strings.isNullOrEmpty(cpuUsed) || cpuUsed.matches("^[0-9\\.\\-]+%$"), "cpuUsed value should be a decimal number followed by %");
       this.id = checkNotNull(id, "id");
       this.account = account;
       this.cpuCount = cpuCount;