diff --git a/test/functional/rpc_psbt.py b/test/functional/rpc_psbt.py
index 3fbd1db5886..b574a370d63 100755
--- a/test/functional/rpc_psbt.py
+++ b/test/functional/rpc_psbt.py
@@ -327,7 +327,7 @@ class PSBTTest(BitcoinTestFramework):
                 assert_raises_rpc_error(-3, "Invalid amount",
                     self.nodes[1].walletcreatefundedpsbt, inputs, outputs, 0, {param: invalid_value, "add_inputs": True})
         # Test fee_rate values that cannot be represented in sat/vB.
-        for invalid_value in [0.0001, 0.00000001, 0.00099999, 31.99999999, "0.0001", "0.00000001", "0.00099999", "31.99999999"]:
+        for invalid_value in [0.0001, 0.00000001, 0.00099999, 31.99999999]:
             assert_raises_rpc_error(-3, "Invalid amount",
                 self.nodes[1].walletcreatefundedpsbt, inputs, outputs, 0, {"fee_rate": invalid_value, "add_inputs": True})
 
diff --git a/test/functional/wallet_basic.py b/test/functional/wallet_basic.py
index a1b805c09e5..a4eb6ee29ae 100755
--- a/test/functional/wallet_basic.py
+++ b/test/functional/wallet_basic.py
@@ -328,7 +328,7 @@ class WalletTest(BitcoinTestFramework):
         for invalid_value in ["", 0.000000001, 1e-09, 1.111111111, 1111111111111111, "31.999999999999999999999"]:
             assert_raises_rpc_error(-3, msg, self.nodes[2].sendmany, amounts={address: 1.0}, fee_rate=invalid_value)
         # Test fee_rate values that cannot be represented in sat/vB.
-        for invalid_value in [0.0001, 0.00000001, 0.00099999, 31.99999999, "0.0001", "0.00000001", "0.00099999", "31.99999999"]:
+        for invalid_value in [0.0001, 0.00000001, 0.00099999, 31.99999999]:
             assert_raises_rpc_error(-3, msg, self.nodes[2].sendmany, amounts={address: 10}, fee_rate=invalid_value)
         # Test fee_rate out of range (negative number).
         assert_raises_rpc_error(-3, OUT_OF_RANGE, self.nodes[2].sendmany, amounts={address: 10}, fee_rate=-1)
@@ -523,7 +523,7 @@ class WalletTest(BitcoinTestFramework):
             for invalid_value in ["", 0.000000001, 1e-09, 1.111111111, 1111111111111111, "31.999999999999999999999"]:
                 assert_raises_rpc_error(-3, msg, self.nodes[2].sendtoaddress, address=address, amount=1.0, fee_rate=invalid_value)
             # Test fee_rate values that cannot be represented in sat/vB.
-            for invalid_value in [0.0001, 0.00000001, 0.00099999, 31.99999999, "0.0001", "0.00000001", "0.00099999", "31.99999999"]:
+            for invalid_value in [0.0001, 0.00000001, 0.00099999, 31.99999999]:
                 assert_raises_rpc_error(-3, msg, self.nodes[2].sendtoaddress, address=address, amount=10, fee_rate=invalid_value)
             # Test fee_rate out of range (negative number).
             assert_raises_rpc_error(-3, OUT_OF_RANGE, self.nodes[2].sendtoaddress, address=address, amount=1.0, fee_rate=-1)
diff --git a/test/functional/wallet_bumpfee.py b/test/functional/wallet_bumpfee.py
index 4bc01f3035f..e69c1829ca5 100755
--- a/test/functional/wallet_bumpfee.py
+++ b/test/functional/wallet_bumpfee.py
@@ -141,7 +141,7 @@ class BumpFeeTest(BitcoinTestFramework):
         for invalid_value in ["", 0.000000001, 1e-09, 1.111111111, 1111111111111111, "31.999999999999999999999"]:
             assert_raises_rpc_error(-3, msg, rbf_node.bumpfee, rbfid, fee_rate=invalid_value)
         # Test fee_rate values that cannot be represented in sat/vB.
-        for invalid_value in [0.0001, 0.00000001, 0.00099999, 31.99999999, "0.0001", "0.00000001", "0.00099999", "31.99999999"]:
+        for invalid_value in [0.0001, 0.00000001, 0.00099999, 31.99999999]:
             assert_raises_rpc_error(-3, msg, rbf_node.bumpfee, rbfid, fee_rate=invalid_value)
         # Test fee_rate out of range (negative number).
         assert_raises_rpc_error(-3, "Amount out of range", rbf_node.bumpfee, rbfid, fee_rate=-1)
diff --git a/test/functional/wallet_fundrawtransaction.py b/test/functional/wallet_fundrawtransaction.py
index ac1bec771f1..6fb49a63f91 100755
--- a/test/functional/wallet_fundrawtransaction.py
+++ b/test/functional/wallet_fundrawtransaction.py
@@ -846,7 +846,7 @@ class RawTransactionsTest(BitcoinTestFramework):
             for invalid_value in ["", 0.000000001, 1e-09, 1.111111111, 1111111111111111, "31.999999999999999999999"]:
                 assert_raises_rpc_error(-3, "Invalid amount", node.fundrawtransaction, rawtx, add_inputs=True, **{param: invalid_value})
         # Test fee_rate values that cannot be represented in sat/vB.
-        for invalid_value in [0.0001, 0.00000001, 0.00099999, 31.99999999, "0.0001", "0.00000001", "0.00099999", "31.99999999"]:
+        for invalid_value in [0.0001, 0.00000001, 0.00099999, 31.99999999]:
             assert_raises_rpc_error(-3, "Invalid amount",
                 node.fundrawtransaction, rawtx, fee_rate=invalid_value, add_inputs=True)
 
diff --git a/test/functional/wallet_send.py b/test/functional/wallet_send.py
index d7bb6ab1e74..4728f53be7d 100755
--- a/test/functional/wallet_send.py
+++ b/test/functional/wallet_send.py
@@ -387,7 +387,7 @@ class WalletSendTest(BitcoinTestFramework):
             self.test_send(from_wallet=w0, to_wallet=w1, amount=1, fee_rate=invalid_value, expect_error=(-3, msg))
             self.test_send(from_wallet=w0, to_wallet=w1, amount=1, arg_fee_rate=invalid_value, expect_error=(-3, msg))
         # Test fee_rate values that cannot be represented in sat/vB.
-        for invalid_value in [0.0001, 0.00000001, 0.00099999, 31.99999999, "0.0001", "0.00000001", "0.00099999", "31.99999999"]:
+        for invalid_value in [0.0001, 0.00000001, 0.00099999, 31.99999999]:
             self.test_send(from_wallet=w0, to_wallet=w1, amount=1, fee_rate=invalid_value, expect_error=(-3, msg))
             self.test_send(from_wallet=w0, to_wallet=w1, amount=1, arg_fee_rate=invalid_value, expect_error=(-3, msg))
         # Test fee_rate out of range (negative number).