diff --git a/tests/lwip/tests/01-run.py b/tests/lwip/tests/01-run.py
index 39ca92636f270d2cc4d560b750bd85e05e9787dd..f4e218bad8fc93c6c9c73073d1920cb0220c94f7 100755
--- a/tests/lwip/tests/01-run.py
+++ b/tests/lwip/tests/01-run.py
@@ -308,7 +308,7 @@ def test_triple_send(board_group, application, env=None):
         receiver.expect(u"00000000  DE  AD  BE  EF")
 
 if __name__ == "__main__":
-    TestStrategy().execute([BoardGroup((Board("native", "tap0"), \
-                            Board("native", "tap1")))], \
+    TestStrategy().execute([BoardGroup((Board("native", "tap0"),
+                            Board("native", "tap1")))],
                            [test_ipv6_send, test_udpv6_send, test_tcpv6_send,
                             test_triple_send])
diff --git a/tests/posix_time/tests/01-run.py b/tests/posix_time/tests/01-run.py
index 60ced1cfa6d39776a7597d71b93ae07ca00afb66..036cf5026a11568c56f57c50639b0901c4e1c072 100755
--- a/tests/posix_time/tests/01-run.py
+++ b/tests/posix_time/tests/01-run.py
@@ -41,7 +41,7 @@ def testfunc(child):
         lower_bound = exp - (exp * EXTERNAL_JITTER)
         upper_bound = exp + (exp * EXTERNAL_JITTER)
         if not (lower_bound < testtime < upper_bound):
-            raise InvalidTimeout("Host timer measured %d us (client measured %d us)" % \
+            raise InvalidTimeout("Host timer measured %d us (client measured %d us)" %
                                  (testtime, exp))
     except InvalidTimeout as e:
         print(e)
diff --git a/tests/xtimer_usleep/tests/01-run.py b/tests/xtimer_usleep/tests/01-run.py
index 489cae3b91c1fb48d9b8b14a5987463c7dadde88..3e41763a1116e75d3f5a5c8b32cb1c5e1fb5d70f 100755
--- a/tests/xtimer_usleep/tests/01-run.py
+++ b/tests/xtimer_usleep/tests/01-run.py
@@ -48,7 +48,7 @@ def testfunc(child):
         lower_bound = exp - (exp * EXTERNAL_JITTER)
         upper_bound = exp + (exp * EXTERNAL_JITTER)
         if not (lower_bound < testtime < upper_bound):
-            raise InvalidTimeout("Host timer measured %d us (client measured %d us)" % \
+            raise InvalidTimeout("Host timer measured %d us (client measured %d us)" %
                                  (testtime, exp))
     except InvalidTimeout as e:
         print(e)