Index: lavtools/lavpipe.c
--- lavtools/lavpipe.c.orig
+++ lavtools/lavpipe.c
@@ -540,7 +540,7 @@ KEEP_SOURCE: ;
 static
 void parse_command_line(int argc, char *argv[], commandline_params_t *cl)
 {
-  char c;
+  int c;
   int err;
 
   cl->verbose = 1;
