diff --git a/test/functional/multiwallet.py b/test/functional/multiwallet.py
--- a/test/functional/multiwallet.py
+++ b/test/functional/multiwallet.py
@@ -24,18 +24,18 @@
         self.stop_node(0)
 
         # should not initialize if there are duplicate wallets
-        assert_start_raises_init_error(0, self.options.tmpdir, [
+        self.assert_start_raises_init_error(0, self.options.tmpdir, [
             '-wallet=w1', '-wallet=w1'], 'Error loading wallet w1. Duplicate -wallet filename specified.')
 
         # should not initialize if wallet file is a directory
         os.mkdir(os.path.join(self.options.tmpdir, 'node0', 'regtest', 'w11'))
-        assert_start_raises_init_error(0, self.options.tmpdir, [
+        self.assert_start_raises_init_error(0, self.options.tmpdir, [
             '-wallet=w11'], 'Error loading wallet w11. -wallet filename must be a regular file.')
 
         # should not initialize if wallet file is a symlink
         os.symlink(os.path.join(self.options.tmpdir, 'node0', 'regtest', 'w1'),
                    os.path.join(self.options.tmpdir, 'node0', 'regtest', 'w12'))
-        assert_start_raises_init_error(0, self.options.tmpdir, [
+        self.assert_start_raises_init_error(0, self.options.tmpdir, [
             '-wallet=w12'], 'Error loading wallet w12. -wallet filename must be a regular file.')
 
         self.nodes[0] = self.start_node(