diff --git a/test/functional/feature_addrman.py b/test/functional/feature_addrman.py
index 95d33d62ead..c17b697ec1e 100755
--- a/test/functional/feature_addrman.py
+++ b/test/functional/feature_addrman.py
@@ -29,14 +29,14 @@ def serialize_addrman(
     INCOMPATIBILITY_BASE = 32
     r = MAGIC_BYTES[net_magic]
     r += struct.pack("B", format)
-    r += struct.pack("B", INCOMPATIBILITY_BASE + lowest_compatible)
+    r += struct.pack("B", (INCOMPATIBILITY_BASE + lowest_compatible))
     r += ser_uint256(bucket_key)
-    r += struct.pack("<i", len_new or len(new))
-    r += struct.pack("<i", len_tried or len(tried))
+    r += struct.pack("<i", (len_new or len(new)))
+    r += struct.pack("<i", (len_tried or len(tried)))
     ADDRMAN_NEW_BUCKET_COUNT = 1 << 10
-    r += struct.pack("<i", ADDRMAN_NEW_BUCKET_COUNT ^ (1 << 30))
+    r += struct.pack("<i", (ADDRMAN_NEW_BUCKET_COUNT ^ (1 << 30)))
     for _ in range(ADDRMAN_NEW_BUCKET_COUNT):
-        r += struct.pack("<i", 0)
+        r += struct.pack("<i", (0))
     checksum = hash256(r)
     r += mock_checksum or checksum
     return r
diff --git a/test/functional/test_framework/script.py b/test/functional/test_framework/script.py
index 7b19d31e178..ee3c3a0efd4 100644
--- a/test/functional/test_framework/script.py
+++ b/test/functional/test_framework/script.py
@@ -58,9 +58,9 @@ class CScriptOp(int):
         elif len(d) <= 0xff:
             return b'\x4c' + bytes([len(d)]) + d  # OP_PUSHDATA1
         elif len(d) <= 0xffff:
-            return b'\x4d' + struct.pack(b'<H', len(d)) + d  # OP_PUSHDATA2
+            return b'\x4d' + struct.pack('<H', len(d)) + d  # OP_PUSHDATA2
         elif len(d) <= 0xffffffff:
-            return b'\x4e' + struct.pack(b'<I', len(d)) + d  # OP_PUSHDATA4
+            return b'\x4e' + struct.pack('<I', len(d)) + d  # OP_PUSHDATA4
         else:
             raise ValueError("Data too long to encode in a PUSHDATA op")
 
@@ -670,7 +670,7 @@ def LegacySignatureMsg(script, txTo, inIdx, hashtype):
         txtmp.vin.append(tmp)
 
     s = txtmp.serialize_without_witness()
-    s += struct.pack(b"<I", hashtype)
+    s += struct.pack("<I", hashtype)
 
     return (s, None)