diff --git a/src/tja2fumen/__init__.py b/src/tja2fumen/__init__.py
index 49ac1d6..7945c91 100644
--- a/src/tja2fumen/__init__.py
+++ b/src/tja2fumen/__init__.py
@@ -39,7 +39,7 @@ def main(argv=None):
 
     # Write fumen data to files
     for fumenData, outputName in zip(parsedSongsFumen.values(), outputFilenames):
-        writeFumen(open(outputName, "wb"), fumenData)
+        writeFumen(outputName, fumenData)
 
     if return_vars:
         return parsedSongsTJA, parsedSongsFumen, outputFilenames
diff --git a/src/tja2fumen/parsers.py b/src/tja2fumen/parsers.py
index e3e474b..771d9a4 100644
--- a/src/tja2fumen/parsers.py
+++ b/src/tja2fumen/parsers.py
@@ -286,10 +286,7 @@ def readFumen(fumenFile, exclude_empty_measures=False):
     For more information on any of the terms used in this function (e.g. scoreInit, scoreDiff),
     please refer to KatieFrog's excellent guide: https://gist.github.com/KatieFrogs/e000f406bbc70a12f3c34a07303eec8b
     """
-    if type(fumenFile) is str:
-        file = open(fumenFile, "rb")
-    else:
-        file = fumenFile
+    file = open(fumenFile, "rb")
     size = os.fstat(file.fileno()).st_size
 
     # Fetch the header bytes
diff --git a/src/tja2fumen/writers.py b/src/tja2fumen/writers.py
index 71fe837..ccb3fde 100644
--- a/src/tja2fumen/writers.py
+++ b/src/tja2fumen/writers.py
@@ -2,11 +2,12 @@ from tja2fumen.utils import writeStruct, putBool
 from tja2fumen.constants import branchNames, typeNotes
 
 
-def writeFumen(file, song):
+def writeFumen(path_out, song):
     # Fetch the byte order (little/big endian)
     order = song['order']
 
     # Write the header
+    file = open(path_out, "wb")
     file.write(song['headerPadding'])   # Write header padding bytes
     file.write(song['headerMetadata'])  # Write header metadata bytes