diff --git a/lib/opcodes.py b/lib/opcodes.py
index 969fe714efd9884aeff55ee7bd6a21acdf84c289..64ca2311c2f890320abba4b25550ea5cfba55fd9 100644
--- a/lib/opcodes.py
+++ b/lib/opcodes.py
@@ -1684,6 +1684,7 @@ class OpInstanceSetParams(OpCode):
      "Per-instance hypervisor parameters, hypervisor-dependent"),
     ("disk_template", None, ht.TMaybe(_BuildDiskTemplateCheck(False)),
      "Disk template for instance"),
+    ("pnode", None, ht.TMaybeString, "New primary node"),
     ("remote_node", None, ht.TMaybeString,
      "Secondary node (used when changing disk template)"),
     ("os_name", None, ht.TMaybeString,
diff --git a/src/Ganeti/OpCodes.hs b/src/Ganeti/OpCodes.hs
index 7eba05015f691e85a4b2e9d34b56799a8395c5a3..1fea2289ac15eae41a985dc1dadf830f3106702c 100644
--- a/src/Ganeti/OpCodes.hs
+++ b/src/Ganeti/OpCodes.hs
@@ -388,6 +388,7 @@ $(genOpCode "OpCode"
      , pRuntimeMem
      , pInstHvParams
      , pOptDiskTemplate
+     , pPrimaryNode
      , pRemoteNode
      , pOsNameChange
      , pInstOsParams
diff --git a/test/hs/Test/Ganeti/OpCodes.hs b/test/hs/Test/Ganeti/OpCodes.hs
index c303fd8d59a372ad90553d2fc07232d3d11ae9ec..17c68507732de5b166b254b1256c656e1b362112 100644
--- a/test/hs/Test/Ganeti/OpCodes.hs
+++ b/test/hs/Test/Ganeti/OpCodes.hs
@@ -263,8 +263,9 @@ instance Arbitrary OpCodes.OpCode where
         OpCodes.OpInstanceSetParams <$> genFQDN <*> arbitrary <*>
           arbitrary <*> arbitrary <*> arbitrary <*> arbitrary <*>
           pure emptyJSObject <*> arbitrary <*> pure emptyJSObject <*>
-          arbitrary <*> genMaybe genNodeNameNE <*> genMaybe genNameNE <*>
-          pure emptyJSObject <*> arbitrary <*> arbitrary <*> arbitrary
+          arbitrary <*> genMaybe genNodeNameNE <*> genMaybe genNodeNameNE <*>
+          genMaybe genNameNE <*> pure emptyJSObject <*> arbitrary <*>
+          arbitrary <*> arbitrary
       "OP_INSTANCE_GROW_DISK" ->
         OpCodes.OpInstanceGrowDisk <$> genFQDN <*> arbitrary <*>
           arbitrary <*> arbitrary <*> arbitrary