diff --git a/tools/host_tests/default_auto.py b/tools/host_tests/default_auto.py
index 7234e366b0..cc233c5a66 100644
--- a/tools/host_tests/default_auto.py
+++ b/tools/host_tests/default_auto.py
@@ -18,7 +18,7 @@ from __future__ import print_function
 
 from sys import stdout
 
-class DefaultAuto():
+class DefaultAuto(object):
     """ Simple, basic host test's test runner waiting for serial port
         output from MUT, no supervision over test running in MUT is executed.
     """
diff --git a/tools/host_tests/detect_auto.py b/tools/host_tests/detect_auto.py
index 2999946c08..c397f3b4a0 100644
--- a/tools/host_tests/detect_auto.py
+++ b/tools/host_tests/detect_auto.py
@@ -17,7 +17,7 @@ limitations under the License.
 
 import re
 
-class DetectPlatformTest():
+class DetectPlatformTest(object):
     PATTERN_MICRO_NAME = "Target '(\w+)'"
     re_detect_micro_name = re.compile(PATTERN_MICRO_NAME)
 
diff --git a/tools/host_tests/dev_null_auto.py b/tools/host_tests/dev_null_auto.py
index 4538f6d79e..c7e0238c7a 100644
--- a/tools/host_tests/dev_null_auto.py
+++ b/tools/host_tests/dev_null_auto.py
@@ -15,7 +15,7 @@ See the License for the specific language governing permissions and
 limitations under the License.
 """
 
-class DevNullTest():
+class DevNullTest(object):
 
     def check_readline(self, selftest, text):
         """ Reads line from serial port and checks if text was part of read string
diff --git a/tools/host_tests/echo.py b/tools/host_tests/echo.py
index 75e534fb84..1aa18b6bb8 100644
--- a/tools/host_tests/echo.py
+++ b/tools/host_tests/echo.py
@@ -19,7 +19,7 @@ import sys
 import uuid
 from sys import stdout
 
-class EchoTest():
+class EchoTest(object):
 
     # Test parameters
     TEST_SERIAL_BAUDRATE = 115200
diff --git a/tools/host_tests/rtc_auto.py b/tools/host_tests/rtc_auto.py
index d267936517..67528031f7 100644
--- a/tools/host_tests/rtc_auto.py
+++ b/tools/host_tests/rtc_auto.py
@@ -18,7 +18,7 @@ limitations under the License.
 import re
 from time import time, strftime, gmtime
 
-class RTCTest():
+class RTCTest(object):
     PATTERN_RTC_VALUE = "\[(\d+)\] \[(\d+-\d+-\d+ \d+:\d+:\d+ [AaPpMm]{2})\]"
     re_detect_rtc_value = re.compile(PATTERN_RTC_VALUE)
 
diff --git a/tools/host_tests/tcpecho_server_loop.py b/tools/host_tests/tcpecho_server_loop.py
index d38258c959..7317e302b3 100644
--- a/tools/host_tests/tcpecho_server_loop.py
+++ b/tools/host_tests/tcpecho_server_loop.py
@@ -14,6 +14,7 @@ WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 See the License for the specific language governing permissions and
 limitations under the License.
 """
+from __future__ import print_function
 # Be sure that the tools directory is in the search path
 import sys
 from os.path import join, abspath, dirname
diff --git a/tools/host_tests/udpecho_server.py b/tools/host_tests/udpecho_server.py
index 5a9f2cab62..96c2db7fb8 100644
--- a/tools/host_tests/udpecho_server.py
+++ b/tools/host_tests/udpecho_server.py
@@ -14,6 +14,7 @@ WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 See the License for the specific language governing permissions and
 limitations under the License.
 """
+from __future__ import print_function
 try:
     from SocketServer import BaseRequestHandler, UDPServer
 except ImportError: