diff --git a/r128gain/__init__.py b/r128gain/__init__.py
index 79a5cbd..d8f13ba 100755
--- a/r128gain/__init__.py
+++ b/r128gain/__init__.py
@@ -86,7 +86,7 @@ def get_ffmpeg_lib_versions(ffmpeg_path: Optional[str] = None) -> Dict[str, int]
     Example: 0x3040100 for FFmpeg 3.4.1
     """
     r = collections.OrderedDict()
-    cmd = (ffmpeg_path or "ffmpeg", "-version")
+    cmd = (ffmpeg_path or "@ffmpeg@/bin/ffmpeg", "-version")
     output_str = subprocess.run(cmd, check=True, stdout=subprocess.PIPE, universal_newlines=True).stdout
     output_lines = output_str.splitlines()
     lib_version_regex = re.compile(r"^\s*(lib[a-z]+)\s+([0-9]+).\s*([0-9]+).\s*([0-9]+)\s+")
@@ -194,7 +194,7 @@ def get_r128_loudness(  # noqa: C901
         ffmpeg.output(*output_streams, os.devnull, **additional_ffmpeg_args, f="null").global_args(
             "-hide_banner", "-nostats"
         ),
-        cmd=ffmpeg_path or "ffmpeg",
+        cmd=ffmpeg_path or "@ffmpeg@/bin/ffmpeg",
     )
 
     # run
@@ -885,7 +885,7 @@ def cl_main() -> None:
     arg_parser.add_argument(
         "-f",
         "--ffmpeg-path",
-        default=shutil.which("ffmpeg"),
+        default="@ffmpeg@/bin/ffmpeg",
         help="""Full file path of ffmpeg executable (only needed if not in PATH).
                 If not specified, autodetect""",
     )