diff --git a/bytebeat_compiler.py b/bytebeat_compiler.py
index 1ad0a01..9f38182 100644
--- a/bytebeat_compiler.py
+++ b/bytebeat_compiler.py
@@ -55,7 +55,7 @@ def substitute_vars(replacements: dict, text: str) -> str:
 	return text
 
 CC = fetch("CC")
-CFLAGS = fetch("CC_FLAGS")
+CFLAGS = fetch("CFLAGS")
 INPUT_FILE = fetch("INPUT_FILE")
 OUTPUT_FILE = fetch("OUTPUT_FILE")