diff --git a/vochain/process_test.go b/vochain/process_test.go
index db28bcfa1..357a34692 100644
--- a/vochain/process_test.go
+++ b/vochain/process_test.go
@@ -509,7 +509,7 @@ func TestSetProcessCensusSize(t *testing.T) {
 	process := &models.Process{
 		StartBlock:    1,
 		EnvelopeType:  &models.EnvelopeType{EncryptedVotes: false},
-		Mode:          &models.ProcessMode{Interruptible: true, DynamicCensus: true},
+		Mode:          &models.ProcessMode{Interruptible: true, DynamicCensus: false},
 		VoteOptions:   &models.ProcessVoteOptions{MaxCount: 16, MaxValue: 16},
 		Status:        models.ProcessStatus_READY,
 		EntityId:      accounts[0].Address().Bytes(),
@@ -528,8 +528,12 @@ func TestSetProcessCensusSize(t *testing.T) {
 	qt.Assert(t, err, qt.IsNil)
 	qt.Assert(t, proc.MaxCensusSize, qt.Equals, uint64(2))
 
-	// Set census size and new root (should work)
-	qt.Assert(t, testSetProcessCensus(t, pid, accounts[0], app, util.RandomBytes(32), &censusURI, 5), qt.IsNil)
+	// Set census size with root (should failg since dynamicCensus=false)
+	qt.Assert(t, testSetProcessCensus(t, pid, accounts[0], app, util.RandomBytes(32), nil, 5), qt.IsNotNil)
+	app.AdvanceTestBlock()
+
+	// Set census size (should work)
+	qt.Assert(t, testSetProcessCensus(t, pid, accounts[0], app, nil, nil, 5), qt.IsNil)
 	app.AdvanceTestBlock()
 
 	proc, err = app.State.Process(pid, true)
diff --git a/vochain/state/process.go b/vochain/state/process.go
index 00dad9951..efc299c79 100644
--- a/vochain/state/process.go
+++ b/vochain/state/process.go
@@ -318,16 +318,17 @@ func (v *State) SetProcessCensus(pid, censusRoot []byte, censusURI string, censu
 	if err != nil {
 		return err
 	}
-	// check valid state transition
-	// dynamic census
-	if !process.Mode.DynamicCensus {
-		return fmt.Errorf(
-			"cannot update census, only processes with dynamic census can update their census")
-	}
-	// census origin
-	if !CensusOrigins[process.CensusOrigin].AllowCensusUpdate {
-		return fmt.Errorf(
-			"cannot update census, invalid census origin: %s", process.CensusOrigin)
+	// check dynamic census only if root is being updated
+	if censusRoot != nil {
+		if !process.Mode.DynamicCensus {
+			return fmt.Errorf(
+				"cannot update census, only processes with dynamic census can update their root")
+		}
+		// census origin
+		if !CensusOrigins[process.CensusOrigin].AllowCensusUpdate {
+			return fmt.Errorf(
+				"cannot update census, census origin %s does not allow update", process.CensusOrigin)
+		}
 	}
 	// status
 	if !(process.Status == models.ProcessStatus_READY) &&
@@ -352,8 +353,6 @@ func (v *State) SetProcessCensus(pid, censusRoot []byte, censusURI string, censu
 	if commit {
 		if censusRoot != nil {
 			process.CensusRoot = censusRoot
-		}
-		if censusURI != "" {
 			process.CensusURI = &censusURI
 		}
 		if censusSize > 0 {