diff --git a/stages/test/test_mkfs_btrfs.py b/stages/test/test_mkfs_btrfs.py
index 70286d82..9fddcf02 100644
--- a/stages/test/test_mkfs_btrfs.py
+++ b/stages/test/test_mkfs_btrfs.py
@@ -71,9 +71,9 @@ def test_mkfs_btrfs_integration(tmp_path, stage_module):
     output = subprocess.check_output([
         "btrfs", "filesystem", "show", fake_disk_path], encoding="utf-8")
     assert f'uuid: {fake_uuid}' in output, \
-           f'expected UUID not found in: {output}'
+        f'expected UUID not found in: {output}'
     assert f'Label: \'{fake_label}\'' in output, \
-           f'expected label not found in: {output}'
+        f'expected label not found in: {output}'
 
 
 @pytest.mark.parametrize("test_input, expected", [
diff --git a/stages/test/test_mkfs_fat.py b/stages/test/test_mkfs_fat.py
index 5e336505..f79b5e43 100644
--- a/stages/test/test_mkfs_fat.py
+++ b/stages/test/test_mkfs_fat.py
@@ -74,11 +74,11 @@ def test_mkfs_fat_integration(tmp_path, stage_module):
     output = subprocess.check_output([
         "file", "-s", fake_disk_path], encoding="utf-8")
     assert f'serial number 0x{fake_volid}' in output, \
-           f'expected serial number (volid) not found in: {output}'
+        f'expected serial number (volid) not found in: {output}'
     assert f'label: "{fake_label}    "' in output, \
-           f'expected label not found in: {output}'
+        f'expected label not found in: {output}'
     assert f'FAT ({fat_size} bit)' in output, \
-           f'expected FAT size not found in: {output}'
+        f'expected FAT size not found in: {output}'
 
 
 @pytest.mark.parametrize("test_input, expected", [
diff --git a/stages/test/test_mkfs_xfs.py b/stages/test/test_mkfs_xfs.py
index af024ae6..70ea1b05 100644
--- a/stages/test/test_mkfs_xfs.py
+++ b/stages/test/test_mkfs_xfs.py
@@ -71,9 +71,9 @@ def test_mkfs_xfs_integration(tmp_path, stage_module):
     output = subprocess.check_output([
         "xfs_admin", "-l", "-u", fake_disk_path], encoding="utf-8")
     assert f'UUID = {fake_uuid}' in output, \
-           f'expected UUID not found in: {output}'
+        f'expected UUID not found in: {output}'
     assert f'label = "{fake_label}"' in output, \
-           f'expected label not found in: {output}'
+        f'expected label not found in: {output}'
 
 
 @pytest.mark.parametrize("test_input, expected", [
diff --git a/test/run/test_mount.py b/test/run/test_mount.py
index ab99fe60..5ec1f51f 100755
--- a/test/run/test_mount.py
+++ b/test/run/test_mount.py
@@ -178,8 +178,8 @@ def create_image_with_partitions(tmp_path):
         ["parted", "--script", img, "mklabel", "msdos"],
         ["parted", "--script", img, "mkpart", "primary", "ext4", "1MiB", "10Mib"],
         ["parted", "--script", img, "mkpart", "primary", "ext4", "10MiB", "19Mib"],
-        ["mkfs.ext4", "-F", "-E", f"offset={1*1024*1024}", img, "9M"],
-        ["mkfs.ext4", "-F", "-E", f"offset={10*1024*1024}", img, "9M"],
+        ["mkfs.ext4", "-F", "-E", f"offset={1 * 1024 * 1024}", img, "9M"],
+        ["mkfs.ext4", "-F", "-E", f"offset={10 * 1024 * 1024}", img, "9M"],
     ]:
         subprocess.check_call(cmd)
     return tree, img.name
diff --git a/tools/osbuild-mpp b/tools/osbuild-mpp
index 23f68585..0252eac6 100755
--- a/tools/osbuild-mpp
+++ b/tools/osbuild-mpp
@@ -1069,7 +1069,7 @@ class ManifestFile:
                 prob = ""
                 if hasattr(err, 'problem_mark'):
                     mark = err.problem_mark
-                    prob = f": {err.problem} at line {mark.line+1} (col {mark.column+1})"
+                    prob = f": {err.problem} at line {mark.line + 1} (col {mark.column + 1})"
                 print(f"Invalid yaml in \"{path}\"{prob}")
                 sys.exit(1)
         else: