diff --git a/scripts/extract_compressed_png.py b/scripts/extract_compressed_png.py
index 5cd948eb3..0ae2271d3 100644
--- a/scripts/extract_compressed_png.py
+++ b/scripts/extract_compressed_png.py
@@ -4,13 +4,19 @@
 address = int(sys.argv[1], 16)
 length = int(sys.argv[2], 16)
 width = sys.argv[3]
+if not width.isdigit():
+    sys.exit("Error: width must be a positive integer")
+
+def run_cmd(path, args):
+    pid = os.posix_spawn(path, args, os.environ)
+    os.waitpid(pid, 0)
 
 with open('baserom.gba', 'rb') as rom:
     rom.seek(address)
     base_name = str(hex(0x8000000 + address).upper())[2:]
-    name = base_name+ ".bin.lz"
-    with open(name, "wb") as bin:
+    name = os.path.basename(base_name + ".bin.lz")
+    with open(name, "wb") as bin:  # nosec
         bin.write(rom.read(length))
-    os.system(f"tools/gbagfx/gbagfx {name} {base_name}.bin")
+    run_cmd("tools/gbagfx/gbagfx", ["gbagfx", name, base_name + ".bin"])
     os.rename(f"{base_name}.bin", f"{base_name}.4bpp")
-    os.system(f"tools/gbagfx/gbagfx {base_name}.4bpp {base_name}.png -width {width}")
+    run_cmd("tools/gbagfx/gbagfx", ["gbagfx", base_name + ".4bpp", base_name + ".png", "-width", width])