diff --git a/Makefile b/Makefile
index 5be1cf9..70e03ad 100644
--- a/Makefile
+++ b/Makefile
@@ -26,7 +26,7 @@ clean:
 	@rm -rf *.egg-info/ build/ dist/ MANIFEST
 
 format:
-	isort -rc .
+	isort .
 	black .
 
 black:
diff --git a/setup.py b/setup.py
index 9d44a03..48a0262 100644
--- a/setup.py
+++ b/setup.py
@@ -28,8 +28,8 @@ def has_flag(compiler, flagname):
     """Return a boolean indicating whether a flag name is supported on
     the specified compiler.
     """
-    import tempfile
     import os
+    import tempfile
 
     with tempfile.NamedTemporaryFile("w", suffix=".cpp", delete=False) as f:
         f.write("int main (int argc, char **argv) { return 0; }")
diff --git a/test/test_dot.py b/test/test_dot.py
index 222053b..750ace0 100644
--- a/test/test_dot.py
+++ b/test/test_dot.py
@@ -1,9 +1,9 @@
 import matplotlib.pyplot as plt
 import numpy
+import perfplot
 import pytest
 
 import accupy
-import perfplot
 
 
 @pytest.mark.parametrize("cond", [1.0, 1.0e15])
diff --git a/test/test_sums.py b/test/test_sums.py
index c19dee4..b424c89 100644
--- a/test/test_sums.py
+++ b/test/test_sums.py
@@ -1,9 +1,9 @@
 import matplotlib.pyplot as plt
 import numpy
+import perfplot
 import pytest
 
 import accupy
-import perfplot
 
 
 @pytest.mark.parametrize("cond", [1.0, 1.0e15])