diff --git a/bytebeat_compiler.py b/bytebeat_compiler.py
index 1a89995..1fe338e 100644
--- a/bytebeat_compiler.py
+++ b/bytebeat_compiler.py
@@ -5,7 +5,7 @@ if __name__ == "__main__":
 
 from argparse import ArgumentParser
 from os import environ, makedirs, name as os_name, rename
-from os.path import basename, exists, join as path_join
+from os.path import exists, join as path_join
 from shlex import join as command_line_join, split as command_line_split
 from shutil import which
 from sys import stdin, stdout
@@ -47,9 +47,7 @@ DEFAULT_PARAMETERS = {
 	"CC": "cc",
 	"CFLAGS": "-Ofast -march=native -mtune=native -Wall -Wextra -Wpedantic "
 	          "-pedantic -Wno-unused-variable -Wno-unused-but-set-variable "
-	          "-Wno-dangling-else -Wno-parentheses -std=c99",
-	"INPUT_FILE": PATHS["substitute_kept"],
-	"OUTPUT_FILE": PATHS["output_kept"]
+	          "-Wno-dangling-else -Wno-parentheses -std=c99"
 }
 
 stdout_atty = hasattr(stdout, "isatty") and stdout.isatty()
@@ -112,8 +110,6 @@ if os_name == "nt":
 	]
 
 CFLAGS = fetch("CFLAGS")
-INPUT_FILE = fetch("INPUT_FILE")
-OUTPUT_FILE = fetch("OUTPUT_FILE")
 if extra := fetch("CFLAGS_EXTRA"):
 	CFLAGS += " " + extra
 
@@ -144,8 +140,8 @@ if __name__ == "__main__":
 	parser = ArgumentParser(description=\
 		"Substitutes supplied C (non-JavaScript!) bytebeat into the template, "
 		"then attempts to compile the instance of the template. Accepts "
-		"environmental variables `CC`, `CFLAGS`, `INPUT_FILE`, `OUTPUT_FILE`. "
-		"`CFLAGS_EXTRA` can be used to add to default `CFLAGS`.")
+		"environmental variables `CC`, `CFLAGS`. `CFLAGS_EXTRA` can be used to "
+		"add to default `CFLAGS`.")
 	parser.add_argument("file", type=str,
 		help="bytebeat formula file (use `-` to read from stdin)")
 	parser.add_argument("-o", "--output", default="output.wav", type=str,
@@ -351,9 +347,9 @@ if __name__ == "__main__":
 			                 "CC.")
 
 	with TemporaryDirectory() as tmpdirname:
-		temporary_path = lambda path: path_join(tmpdirname, basename(path))
+		temporary_path = lambda path: path_join(tmpdirname, path)
 
-		substitute_temp = temporary_path(INPUT_FILE)
+		substitute_temp = temporary_path(PATHS["substitute"])
 		rewrite_file(substitute_temp, substitute_vars({
             "bytebeat_contents": bytebeat_contents,
             "output_file": C_str_repr(args.output),
@@ -384,7 +380,7 @@ if __name__ == "__main__":
 		# Compile
 		print("Compiling")
 
-		output_file_temp = temporary_path(OUTPUT_FILE)
+		output_file_temp = temporary_path(PATHS["output"])
 
 		run_command(
 			CC,
@@ -399,5 +395,5 @@ if __name__ == "__main__":
 		if args.keep_files:
 			makedirs(PATHS["bin_dir"], exist_ok=True)
 
-			rename(substitute_temp, INPUT_FILE)
-			rename(output_file_temp, OUTPUT_FILE)
+			rename(substitute_temp, PATHS["substitute_kept"])
+			rename(output_file_temp, PATHS["output_kept"])