diff --git a/test/time_feature/__init__.py b/test/time_feature/__init__.py
new file mode 100644
index 0000000000..e69de29bb2
diff --git a/test/time_feature/test_base.py b/test/time_feature/test_base.py
index a5c4e1dbc7..e448156b2b 100644
--- a/test/time_feature/test_base.py
+++ b/test/time_feature/test_base.py
@@ -16,7 +16,7 @@
 
 from gluonts.time_feature import norm_freq_str
 
-from common import M, Q, S, Y
+from .common import M, Q, S, Y
 
 
 @pytest.mark.parametrize(
diff --git a/test/time_feature/test_lag.py b/test/time_feature/test_lag.py
index 650267564b..ad934bbd1d 100644
--- a/test/time_feature/test_lag.py
+++ b/test/time_feature/test_lag.py
@@ -19,7 +19,7 @@
 
 import gluonts.time_feature.lag as date_feature_set
 
-from common import H, M, Q, Y
+from .common import H, M, Q, Y
 
 # These are the expected lags for common frequencies and corner cases.
 # By default all frequencies have the following lags: [1, 2, 3, 4, 5, 6, 7].
@@ -210,8 +210,7 @@
     + [335, 336, 337, 503, 504, 505, 671, 672, 673, 719, 720, 721],
     # centered around each of the last 7 days (delta = 1) + last 4 weeks (delta = 1) + last 1 month (delta = 1) +
     #  last 8th and 12th weeks (delta = 0)
-    "6"
-    + H: [
+    ("6" + H): [
         1,
         2,
         3,
@@ -242,24 +241,21 @@
     + [224, 336],
     # centered around each of the last 7 days (delta = 1) + last 4 weeks (delta = 1) + last 1 month (delta = 1) +
     #  last 8th and 12th weeks (delta = 0) + last year (delta = 1)
-    "12"
-    + H: [1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15]
+    "12" + H: [1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15]
     + [27, 28, 29, 41, 42, 43, 55, 56, 57]
     + [59, 60, 61]
     + [112, 168]
     + [727, 728, 729],
     # centered around each of the last 7 days (delta = 1) + last 4 weeks (delta = 1) + last 1 month (delta = 1) +
     #  last 8th and 12th weeks (delta = 0) + last 3 years (delta = 1)
-    "23"
-    + H: [1, 2, 3, 4, 5, 6, 7, 8]
+    "23" + H: [1, 2, 3, 4, 5, 6, 7, 8]
     + [13, 14, 15, 20, 21, 22, 28, 29]
     + [30, 31, 32]
     + [58, 87]
     + [378, 379, 380, 758, 759, 760, 1138, 1139, 1140],
     # centered around each of the last 7 days (delta = 1) + last 4 weeks (delta = 1) + last 1 month (delta = 1) +
     #  last 8th and 12th weeks (delta = 0) + last 3 years (delta = 1)
-    "25"
-    + H: [1, 2, 3, 4, 5, 6, 7]
+    "25" + H: [1, 2, 3, 4, 5, 6, 7]
     + [12, 13, 14, 19, 20, 21, 25, 26, 27]
     + [28, 29]
     + [53, 80]
diff --git a/test/time_feature/test_seasonality.py b/test/time_feature/test_seasonality.py
index a235dc1c35..3817416c2c 100644
--- a/test/time_feature/test_seasonality.py
+++ b/test/time_feature/test_seasonality.py
@@ -15,7 +15,7 @@
 
 from gluonts.time_feature import get_seasonality
 
-from common import H, M, Q, Y
+from .common import H, M, Q, Y
 
 TEST_CASES = [
     ("30min", 48),