diff --git a/dongle.c b/dongle.c
index def07a00221671e7f8b5733d3b0e17a374531f47..89c3ea8507baa8620bac2f3d62906c7082b49371 100644
--- a/dongle.c
+++ b/dongle.c
@@ -12,6 +12,8 @@ static struct option long_options[] =
 
 int parse_args(int argc, char **argv)
 {
+	char ch;
+
 	while ((ch = getopt_long(argc, argv, ":d:", long_options, NULL)) != -1) {
 	int flag;