diff --git a/qa/rpc-tests/test_framework/cdefs.py b/qa/rpc-tests/test_framework/cdefs.py
index cc9240cab..152f54ec4 100644
--- a/qa/rpc-tests/test_framework/cdefs.py
+++ b/qa/rpc-tests/test_framework/cdefs.py
@@ -1,67 +1,68 @@
 #!/usr/bin/env python3
 # Copyright (c) 2017 The Bitcoin developers
 # Distributed under the MIT software license, see the accompanying
 # file COPYING or http://www.opensource.org/licenses/mit-license.php.
 """
 Imports some application default values from source files outside the test
 framework, and defines equivalents of consensus parameters for the test
 framework.
 """
 
 import os
 import re
 
 from test_framework.util import get_srcdir
 
 # Slurp in consensus.h contents
 _consensus_h_fh = open(os.path.join(get_srcdir(), 'src', 'consensus',
                        'consensus.h'), 'rt')
 _consensus_h_contents = _consensus_h_fh.read()
 _consensus_h_fh.close()
 
 # This constant is currently needed to evaluate some that are formulas
 ONE_MEGABYTE = 1000000
 
 # Extract relevant default values parameters
 
 # The maximum allowed block size before the fork
 LEGACY_MAX_BLOCK_SIZE = ONE_MEGABYTE
 
 # Default setting for maximum allowed size for a block, in bytes
 DEFAULT_MAX_BLOCK_SIZE = eval(
     re.search(r'DEFAULT_MAX_BLOCK_SIZE = (.+);',
               _consensus_h_contents).group(1))
 
-DEFAULT_UAHF_START_TIME = eval(
+# Start time is simple integer constant, so does not need evaluation.
+DEFAULT_UAHF_START_TIME = int(
     re.search(r'DEFAULT_UAHF_START_TIME = (.+);',
               _consensus_h_contents).group(1))
 
 # The following consensus parameters should not be automatically imported.
 # They *should* cause test failures if application code is changed in ways
 # that violate current consensus.
 
 # The maximum allowed number of signature check operations per MB in a block
 # (network rule)
 MAX_BLOCK_SIGOPS_PER_MB = 20000
 
 # The maximum allowed number of signature check operations per transaction
 # (network rule)
 MAX_TX_SIGOPS_COUNT = 20000
 
 # The maximum number of sigops we're willing to relay/mine in a single tx
 # (policy.h constant)
 MAX_STANDARD_TX_SIGOPS = MAX_TX_SIGOPS_COUNT // 5
 
 # Coinbase transaction outputs can only be spent after this number of new
 # blocks (network rule)
 COINBASE_MATURITY = 100
 
 # Anti replay OP_RETURN commitment.
 ANTI_REPLAY_COMMITMENT = b"Bitcoin: A Peer-to-Peer Electronic Cash System"
 
 if __name__ == "__main__":
     # Output values if run standalone to verify
     print("DEFAULT_MAX_BLOCK_SIZE = %d (bytes)" % DEFAULT_MAX_BLOCK_SIZE)
     print("MAX_BLOCK_SIGOPS_PER_MB = %d (sigops)" % MAX_BLOCK_SIGOPS_PER_MB)
     print("MAX_TX_SIGOPS_COUNT = %d (sigops)" % MAX_TX_SIGOPS_COUNT)
     print("COINBASE_MATURITY = %d (blocks)" % COINBASE_MATURITY)