diff --git a/avocado/core/sysinfo.py b/avocado/core/sysinfo.py
index 1838d541d9a50f5a762bb68142a38d5dd14366b5..5179015f34085153aff34969f18778fae251cefb 100644
--- a/avocado/core/sysinfo.py
+++ b/avocado/core/sysinfo.py
@@ -170,10 +170,10 @@ class Command(Collectible):
                              env=env)
         logf_path = os.path.join(logdir, self.logf)
         if self._compress_log:
-            with gzip.GzipFile(logf_path, 'w') as logf:
+            with gzip.GzipFile(logf_path, 'wb') as logf:
                 logf.write(result.stdout)
         else:
-            with open(logf_path, 'w') as logf:
+            with open(logf_path, 'wb') as logf:
                 logf.write(result.stdout)
 
 
diff --git a/selftests/functional/test_output.py b/selftests/functional/test_output.py
index f6d47a95e372a1afe11bb962f830710ded8b03c9..7a19f2620b076580ece5edda3e46103f207b4c75 100644
--- a/selftests/functional/test_output.py
+++ b/selftests/functional/test_output.py
@@ -41,7 +41,7 @@ import sys
 from avocado import Test
 from avocado.utils import process
 
-print "top_print"
+print("top_print")
 sys.stdout.write("top_stdout\\n")
 sys.stderr.write("top_stderr\\n")
 process.run("/bin/echo top_process")
@@ -49,13 +49,13 @@ process.run("/bin/echo top_process")
 class OutputTest(Test):
     def __init__(self, *args, **kwargs):
         super(OutputTest, self).__init__(*args, **kwargs)
-        print "init_print"
+        print("init_print")
         sys.stdout.write("init_stdout\\n")
         sys.stderr.write("init_stderr\\n")
         process.run("/bin/echo init_process")
 
     def test(self):
-        print "test_print"
+        print("test_print")
         sys.stdout.write("test_stdout\\n")
         sys.stderr.write("test_stderr\\n")
         process.run("/bin/echo -n test_process > /dev/stdout",
@@ -66,7 +66,7 @@ class OutputTest(Test):
                     shell=True)
 
     def __del__(self):
-        print "del_print"
+        print("del_print")
         sys.stdout.write("del_stdout\\n")
         sys.stderr.write("del_stderr\\n")
         process.run("/bin/echo -n del_process")
diff --git a/selftests/functional/test_standalone.py b/selftests/functional/test_standalone.py
index 8ab24c4979f9b3df1f4ef19d745e3a7848b0bd13..b6734a48b0492a024ef49f26b677903e9d983d13 100644
--- a/selftests/functional/test_standalone.py
+++ b/selftests/functional/test_standalone.py
@@ -1,4 +1,5 @@
 import os
+import sys
 import unittest
 
 from avocado.core import exit_codes
@@ -45,7 +46,10 @@ class StandaloneTests(unittest.TestCase):
         cmd_line = './examples/tests/errortest_nasty.py -r'
         expected_rc = exit_codes.AVOCADO_TESTS_FAIL
         result = self.run_and_check(cmd_line, expected_rc, 'errortest_nasty')
-        exc = "NastyException: Nasty-string-like-exception"
+        if sys.version_info[0] == 3:
+            exc = "errortest_nasty.NastyException: Nasty-string-like-exception"
+        else:
+            exc = "NastyException: Nasty-string-like-exception"
         count = result.stdout.count("\n%s" % exc)
         self.assertEqual(count, 2, "Exception \\n%s should be present twice in"
                          "the log (once from the log, second time when parsing"
@@ -62,8 +66,11 @@ class StandaloneTests(unittest.TestCase):
         cmd_line = './examples/tests/errortest_nasty3.py -r'
         expected_rc = exit_codes.AVOCADO_TESTS_FAIL
         result = self.run_and_check(cmd_line, expected_rc, 'errortest_nasty3')
-        self.assertIn("TestError: <errortest_nasty3.NastyException instance at ",
-                      result.stdout)
+        if sys.version_info[0] == 3:
+            exc = "TypeError: exceptions must derive from BaseException"
+        else:
+            exc = "TestError: <errortest_nasty3.NastyException instance at "
+        self.assertIn(exc, result.stdout)
 
     def test_errortest(self):
         cmd_line = './examples/tests/errortest.py -r'
diff --git a/selftests/functional/test_utils.py b/selftests/functional/test_utils.py
index 4c6057f9b1444cd242c445160292ad5faecca725..575aadd0538782a0d407a04aefeba4d6c8765125 100644
--- a/selftests/functional/test_utils.py
+++ b/selftests/functional/test_utils.py
@@ -144,7 +144,7 @@ class ProcessTest(unittest.TestCase):
         time.sleep(3)
         proc.terminate()
         proc.wait()
-        stdout = proc.get_stdout()
+        stdout = proc.get_stdout().decode()
         self.assertIn('memory', stdout, 'result: %s' % stdout)
         self.assertRegexpMatches(stdout, '[0-9]+')