diff --git a/src/net.h b/src/net.h
index 77649247d9..8e96b3f351 100644
--- a/src/net.h
+++ b/src/net.h
@@ -55,7 +55,7 @@ static const int FEELER_INTERVAL = 120;
 /** The maximum number of addresses from our addrman to return in response to a getaddr message. */
 static constexpr size_t MAX_ADDR_TO_SEND = 1000;
 /** Maximum length of incoming protocol messages (no message over 4 MB is currently acceptable). */
-static const unsigned int MAX_PROTOCOL_MESSAGE_LENGTH = 4 * 1000 * 1000;
+static const unsigned int MAX_PROTOCOL_MESSAGE_LENGTH = 16 * 1000 * 1000;
 /** Maximum length of the user agent string in `version` message */
 static const unsigned int MAX_SUBVERSION_LENGTH = 256;
 /** Maximum number of automatic outgoing nodes over which we'll relay everything (blocks, tx, addrs, etc) */
diff --git a/test/bitcoin_functional/functional/p2p_invalid_messages.py b/test/bitcoin_functional/functional/p2p_invalid_messages.py
index 700fdf6e04..d30900eba3 100755
--- a/test/bitcoin_functional/functional/p2p_invalid_messages.py
+++ b/test/bitcoin_functional/functional/p2p_invalid_messages.py
@@ -52,7 +52,7 @@ class InvalidMessagesTest(BitcoinTestFramework):
         node.add_p2p_connection(P2PDataStore())
         conn2 = node.add_p2p_connection(P2PDataStore())
 
-        msg_limit = 4 * 1000 * 1000  # 4MB, per MAX_PROTOCOL_MESSAGE_LENGTH
+        msg_limit = 16 * 1000 * 1000  # 16MB, per MAX_PROTOCOL_MESSAGE_LENGTH
         valid_data_limit = msg_limit - 5  # Account for the 4-byte length prefix
 
         #
diff --git a/test/functional/test_framework/messages.py b/test/functional/test_framework/messages.py
index 4f20a35af9..5ab764845c 100755
--- a/test/functional/test_framework/messages.py
+++ b/test/functional/test_framework/messages.py
@@ -46,7 +46,7 @@ MAX_MONEY = 21000000 * COIN
 
 BIP125_SEQUENCE_NUMBER = 0xfffffffd  # Sequence number that is BIP 125 opt-in and BIP 68-opt-out
 
-MAX_PROTOCOL_MESSAGE_LENGTH = 4000000  # Maximum length of incoming protocol messages
+MAX_PROTOCOL_MESSAGE_LENGTH = 16 * 1000 * 1000  # Maximum length of incoming protocol messages
 MAX_HEADERS_RESULTS = 2000  # Number of headers sent in one getheaders result
 MAX_INV_SIZE = 50000  # Maximum number of entries in an 'inv' protocol message