diff --git a/youtube_dl/PostProcessor.py b/youtube_dl/PostProcessor.py
index e0b071a9c..6da24f986 100644
--- a/youtube_dl/PostProcessor.py
+++ b/youtube_dl/PostProcessor.py
@@ -108,7 +108,7 @@ class FFmpegExtractAudioPP(PostProcessor):
             acodec_opts = []
         else:
             acodec_opts = ['-acodec', codec]
-        if self._nopostoverwrites:
+        if self._nopostoverwrites and self._exes['ffmpeg']:
             overwrite_opts = '-n'
         else:
             overwrite_opts = '-y'