diff --git a/core/src/com/cloud/hypervisor/xen/resource/CitrixResourceBase.java b/core/src/com/cloud/hypervisor/xen/resource/CitrixResourceBase.java
index 2f3ad9094d7..2caa49c0924 100755
--- a/core/src/com/cloud/hypervisor/xen/resource/CitrixResourceBase.java
+++ b/core/src/com/cloud/hypervisor/xen/resource/CitrixResourceBase.java
@@ -860,7 +860,7 @@ public abstract class CitrixResourceBase implements ServerResource, HypervisorRe
         String bootArgs = vmSpec.getBootArgs();
         if (bootArgs != null && bootArgs.length() > 0) {
             String pvargs = vm.getPVArgs(conn);
-            pvargs = pvargs + vmSpec.getBootArgs();
+            pvargs = pvargs + vmSpec.getBootArgs().replaceAll(" ", "%");
             if (s_logger.isDebugEnabled()) {
                 s_logger.debug("PV args are " + pvargs);
             }
diff --git a/core/src/com/cloud/hypervisor/xen/resource/XenServer56FP1Resource.java b/core/src/com/cloud/hypervisor/xen/resource/XenServer56FP1Resource.java
index fb5b0ee2254..4ff8a733b55 100644
--- a/core/src/com/cloud/hypervisor/xen/resource/XenServer56FP1Resource.java
+++ b/core/src/com/cloud/hypervisor/xen/resource/XenServer56FP1Resource.java
@@ -180,7 +180,7 @@ public class XenServer56FP1Resource extends XenServer56Resource {
         String bootArgs = vmSpec.getBootArgs();
         if (bootArgs != null && bootArgs.length() > 0) {
             String pvargs = vm.getPVArgs(conn);
-            pvargs = pvargs + vmSpec.getBootArgs();
+            pvargs = pvargs + vmSpec.getBootArgs().replaceAll(" ", "%");
             if (s_logger.isDebugEnabled()) {
                 s_logger.debug("PV args are " + pvargs);
             }
diff --git a/patches/systemvm/debian/config/etc/init.d/cloud-early-config b/patches/systemvm/debian/config/etc/init.d/cloud-early-config
index ae164e33b04..7c0e50da142 100755
--- a/patches/systemvm/debian/config/etc/init.d/cloud-early-config
+++ b/patches/systemvm/debian/config/etc/init.d/cloud-early-config
@@ -89,6 +89,7 @@ get_boot_params() {
   case $hyp in 
      xen-domU)
           cat /proc/cmdline > /var/cache/cloud/cmdline
+          sed -i "s/%/ /g" /var/cache/cloud/cmdline
           ;;
      kvm)
           # KVM needs to mount another disk, to get cmdline