diff --git a/test/functional/test_framework/test_framework.py b/test/functional/test_framework/test_framework.py
--- a/test/functional/test_framework/test_framework.py
+++ b/test/functional/test_framework/test_framework.py
@@ -194,10 +194,19 @@
         config = configparser.ConfigParser()
         config.read_file(open(self.options.configfile, encoding='utf-8'))
         self.config = config
-        self.options.bitcoind = os.getenv(
-            "BITCOIND", default=config["environment"]["BUILDDIR"] + '/src/bitcoind' + config["environment"]["EXEEXT"])
+        fname_bitcoind = os.path.join(
+            config["environment"]["BUILDDIR"],
+            "src",
+            "bitcoind" + config["environment"]["EXEEXT"]
+        )
+        fname_bitcoincli = os.path.join(
+            config["environment"]["BUILDDIR"],
+            "src",
+            "bitcoin-cli" + config["environment"]["EXEEXT"]
+        )
+        self.options.bitcoind = os.getenv("BITCOIND", default=fname_bitcoind)
         self.options.bitcoincli = os.getenv(
-            "BITCOINCLI", default=config["environment"]["BUILDDIR"] + '/src/bitcoin-cli' + config["environment"]["EXEEXT"])
+            "BITCOINCLI", default=fname_bitcoincli)
         self.options.emulator = config["environment"]["EMULATOR"] or None
 
         os.environ['PATH'] = config['environment']['BUILDDIR'] + os.pathsep + \