diff --git a/qemu-monitor.hx b/qemu-monitor.hx
index c176f2c83d..6aa99cef42 100644
--- a/qemu-monitor.hx
+++ b/qemu-monitor.hx
@@ -402,7 +402,7 @@ info mice
 ETEXI
 
 #ifdef HAS_AUDIO
-    { "wavcapture", "path:s,freq:i?,bits:i?,nchannels:i?", do_wav_capture,
+    { "wavcapture", "path:F,freq:i?,bits:i?,nchannels:i?", do_wav_capture,
       "path [frequency [bits [channels]]]",
       "capture audio to a wave file (default frequency=44100 bits=16 channels=2)" },
 #endif