diff --git a/circom_circuits/Blend/generate_inputs_for_poq.py b/circom_circuits/Blend/generate_inputs_for_poq.py
index 01567a3..34304d8 100644
--- a/circom_circuits/Blend/generate_inputs_for_poq.py
+++ b/circom_circuits/Blend/generate_inputs_for_poq.py
@@ -177,7 +177,7 @@ def PoseidonSponge(data, capacity, output_len):
     for i in range(len(data)+1,padded_len):
         padded.append(F(0))
         
-    civ = F(2**64 + 256*3 + rate)
+    civ = F(0)
 
     state = [F(0),F(0),F(civ)]
     sorbed = [F(0) for j in range(rate)]
diff --git a/circom_circuits/Mantle/generate_inputs_for_pol.py b/circom_circuits/Mantle/generate_inputs_for_pol.py
index a5439f4..87651b9 100755
--- a/circom_circuits/Mantle/generate_inputs_for_pol.py
+++ b/circom_circuits/Mantle/generate_inputs_for_pol.py
@@ -177,7 +177,7 @@ def PoseidonSponge(data, capacity, output_len):
     for i in range(len(data)+1,padded_len):
         padded.append(F(0))
         
-    civ = F(2**64 + 256*3 + rate)
+    civ = F(0)
 
     state = [F(0),F(0),F(civ)]
     sorbed = [F(0) for j in range(rate)]
diff --git a/circom_circuits/Mantle/generate_inputs_for_proof_of_claim.py b/circom_circuits/Mantle/generate_inputs_for_proof_of_claim.py
index ab2083c..a00273e 100755
--- a/circom_circuits/Mantle/generate_inputs_for_proof_of_claim.py
+++ b/circom_circuits/Mantle/generate_inputs_for_proof_of_claim.py
@@ -178,7 +178,7 @@ def PoseidonSponge(data, capacity, output_len):
     for i in range(len(data)+1,padded_len):
         padded.append(F(0))
         
-    civ = F(2**64 + 256*3 + rate)
+    civ = F(0)
 
     state = [F(0),F(0),F(civ)]
     sorbed = [F(0) for j in range(rate)]
diff --git a/circom_circuits/Mantle/generate_inputs_for_signature.py b/circom_circuits/Mantle/generate_inputs_for_signature.py
index e7f30d1..5c04f69 100755
--- a/circom_circuits/Mantle/generate_inputs_for_signature.py
+++ b/circom_circuits/Mantle/generate_inputs_for_signature.py
@@ -178,7 +178,7 @@ def PoseidonSponge(data, capacity, output_len):
     for i in range(len(data)+1,padded_len):
         padded.append(F(0))
         
-    civ = F(2**64 + 256*3 + rate)
+    civ = F(0)
 
     state = [F(0),F(0),F(civ)]
     sorbed = [F(0) for j in range(rate)]
diff --git a/circom_circuits/hash_bn/poseidon2_sponge.circom b/circom_circuits/hash_bn/poseidon2_sponge.circom
index ddbb580..82c5aa3 100644
--- a/circom_circuits/hash_bn/poseidon2_sponge.circom
+++ b/circom_circuits/hash_bn/poseidon2_sponge.circom
@@ -52,13 +52,9 @@ template PoseidonSponge(t, capacity, input_len, output_len) {
 
   signal state [nblocks+nout][t   ];
   signal sorbed[nblocks     ][rate];
- 
-  // domain separation, capacity IV:
-  var civ = 2**64 + 256*t + rate;
 
   // initialize state
-  for(var i=0; i<t-1; i++) { state[0][i] <== 0; }
-  state[0][t-1] <== civ;
+  for(var i=0; i<t; i++) { state[0][i] <== 0; }
 
   component absorb [nblocks];
   component squeeze[nout-1];