diff --git a/src/wireviz/Harness.py b/src/wireviz/Harness.py
index c0c8190f..49576529 100644
--- a/src/wireviz/Harness.py
+++ b/src/wireviz/Harness.py
@@ -716,8 +716,7 @@ def output(
         # BOM output
         bomlist = bom_list(self.bom())
         if "tsv" in fmt:
-            with open_file_write(f"{filename}.bom.tsv") as file:
-                file.write(tuplelist2tsv(bomlist))
+            open_file_write(f"{filename}.bom.tsv").write(tuplelist2tsv(bomlist))
         if "csv" in fmt:
             # TODO: implement CSV output (preferrably using CSV library)
             print("CSV output is not yet supported")
diff --git a/src/wireviz/wv_cli.py b/src/wireviz/wv_cli.py
index 83ff164b..73150720 100644
--- a/src/wireviz/wv_cli.py
+++ b/src/wireviz/wv_cli.py
@@ -107,8 +107,7 @@ def wireviz(file, format, prepend, output_dir, output_name, version):
                 raise Exception(f"File does not exist:\n{prepend_file}")
             print("Prepend file:", prepend_file)
 
-            with open_file_read(prepend_file) as file_handle:
-                prepend_input += file_handle.read() + "\n"
+            prepend_input += open_file_read(prepend_file).read() + "\n"
     else:
         prepend_input = ""
 
@@ -127,8 +126,7 @@ def wireviz(file, format, prepend, output_dir, output_name, version):
             "Output file: ", f"{Path(_output_dir / _output_name)}.{output_formats_str}"
         )
 
-        with open_file_read(file) as file_handle:
-            yaml_input = file_handle.read()
+        yaml_input = open_file_read(file).read()
         file_dir = file.parent
 
         yaml_input = prepend_input + yaml_input
diff --git a/src/wireviz/wv_html.py b/src/wireviz/wv_html.py
index 6b85ef71..b30bdeeb 100644
--- a/src/wireviz/wv_html.py
+++ b/src/wireviz/wv_html.py
@@ -34,8 +34,7 @@ def generate_html_output(
         # fall back to built-in simple template if no template was provided
         templatefile = Path(__file__).parent / "templates/simple.html"
 
-    with open_file_read(templatefile) as file:
-        html = file.read()
+    html = open_file_read(templatefile).read()
 
     # embed SVG diagram
     with open_file_read(f"{filename}.svg") as file:
@@ -117,5 +116,4 @@ def generate_html_output(
     pattern = re.compile("|".join(replacements_escaped))
     html = pattern.sub(lambda match: replacements[match.group(0)], html)
 
-    with open_file_write(f"{filename}.html") as file:
-        file.write(html)
+    open_file_write(f"{filename}.html").write(html)