diff --git a/tests/bluecellulab-bb5-tests/Makefile b/tests/bluecellulab-bb5-tests/Makefile
index 75f538a2..3114f9f1 100644
--- a/tests/bluecellulab-bb5-tests/Makefile
+++ b/tests/bluecellulab-bb5-tests/Makefile
@@ -2,7 +2,7 @@
 PIP_INDEX_URL := https://pypi.python.org/simple
 NEURON_MODULE_OPTIONS := '-nogui'
 TESTS_DIR := tests
-MECHANISMS_DIR := ./../tests/mechanisms/
+MECHANISMS_DIR := ./../mechanisms/
 PYTEST_OPTS := --numprocesses=auto --timeout=600 -vsx --forked
 
 # Default rule (similar to 'testenv' in tox)
diff --git a/tests/bluecellulab-bb5-tests/tests/test_ssim.py b/tests/bluecellulab-bb5-tests/tests/test_ssim.py
index 2a621994..7145073d 100644
--- a/tests/bluecellulab-bb5-tests/tests/test_ssim.py
+++ b/tests/bluecellulab-bb5-tests/tests/test_ssim.py
@@ -125,7 +125,7 @@ def test_compare_traces(self):
         assert len(voltage_bglib) == len(time_bglib) == 1000
 
         voltage_bglibpy = self.ssim_bglibpy.get_voltage_trace(self.gid)[
-            0 : len(voltage_bglib)
+            0: len(voltage_bglib)
         ]
 
         rms_error = rms(voltage_bglibpy, voltage_bglib)
@@ -176,7 +176,7 @@ def test_compare_traces(self):
         assert len(voltage_bglib) == 1000
 
         voltage_bglibpy = self.ssim_bglibpy.get_voltage_trace(self.gid)[
-            0 : len(voltage_bglib)
+            0: len(voltage_bglib)
         ]
 
         rms_error = rms(voltage_bglibpy, voltage_bglib)
@@ -189,7 +189,7 @@ def test_disable_replay(self):
 
         voltage_bglibpy_withoutreplay = (
             self.ssim_bglibpy_withoutreplay.get_voltage_trace(self.gid)[
-                0 : len(voltage_bglib)
+                0: len(voltage_bglib)
             ]
         )
 
@@ -231,7 +231,7 @@ def test_compare_traces(self):
         assert len(voltage_bglib) == 1000
 
         voltage_bglibpy = self.ssim_bglibpy.get_voltage_trace(self.gid)[
-            0 : len(voltage_bglib)
+            0: len(voltage_bglib)
         ]
 
         rms_error = rms(voltage_bglibpy, voltage_bglib)
@@ -273,7 +273,7 @@ def test_compare_traces(self):
         assert len(voltage_bglib) == 1000
 
         voltage_bglibpy = self.ssim_bglibpy.get_voltage_trace(self.gid)[
-            0 : len(voltage_bglib)
+            0: len(voltage_bglib)
         ]
 
         rms_error = rms(voltage_bglibpy, voltage_bglib)
@@ -424,7 +424,7 @@ def test_compare_traces(self):
         assert len(self.voltage_bglib_mvr) == 1000
 
         voltage_bglibpy_mvr = self.ssim_bglibpy_mvr.get_voltage_trace(self.gid)[
-            0 : len(self.voltage_bglib_mvr)
+            0: len(self.voltage_bglib_mvr)
         ]
 
         rms_error = rms(voltage_bglibpy_mvr, self.voltage_bglib_mvr)
@@ -482,7 +482,7 @@ def test_compare_traces(self):
         assert len(voltage_bglib) == 1000
 
         voltage_bglibpy = self.ssim_bglibpy.get_voltage_trace(self.gid)[
-            0 : len(voltage_bglib)
+            0: len(voltage_bglib)
         ]
 
         rms_error = rms(voltage_bglibpy, voltage_bglib)
@@ -495,7 +495,7 @@ def test_disable_minis(self):
 
         voltage_bglibpy_withoutminis = self.ssim_bglibpy_withoutminis.get_voltage_trace(
             self.gid
-        )[0 : len(voltage_bglib)]
+        )[0: len(voltage_bglib)]
 
         rms_error = rms(voltage_bglibpy_withoutminis, voltage_bglib)
 
@@ -546,7 +546,7 @@ def test_compare_traces(self):
         assert len(voltage_bglib) == 1000
 
         voltage_bglibpy = self.ssim_bglibpy.get_voltage_trace(self.gid)[
-            0 : len(voltage_bglib)
+            0: len(voltage_bglib)
         ]
 
         rms_error = rms(voltage_bglibpy, voltage_bglib)
@@ -559,7 +559,7 @@ def test_disable_stimuli(self):
 
         voltage_bglibpy_withoutstim = self.ssim_bglibpy_withoutstim.get_voltage_trace(
             self.gid
-        )[0 : len(voltage_bglib)]
+        )[0: len(voltage_bglib)]
 
         rms_error = rms(voltage_bglibpy_withoutstim, voltage_bglib)
         assert rms_error > 1.0
@@ -608,7 +608,7 @@ def test_compare_traces(self):
         assert len(voltage_bglib) == 1000
 
         voltage_bglibpy = self.ssim_bglibpy.get_voltage_trace(self.gid)[
-            0 : len(voltage_bglib)
+            0: len(voltage_bglib)
         ]
 
         rms_error = rms(voltage_bglibpy, voltage_bglib)
@@ -622,7 +622,7 @@ def test_disable_stimuli(self):
 
         voltage_bglibpy_withoutstim = self.ssim_bglibpy_withoutstim.get_voltage_trace(
             self.gid
-        )[0 : len(voltage_bglib)]
+        )[0: len(voltage_bglib)]
 
         rms_error = rms(voltage_bglibpy_withoutstim, voltage_bglib)
         assert rms_error > 20.0