diff --git a/tools/mkimage.c b/tools/mkimage.c
index d9939583f5533cd044b32e98b66aa34468dd9157..3c594a0f3b92f1cf73b282c85b36674838c65fa0 100644
--- a/tools/mkimage.c
+++ b/tools/mkimage.c
@@ -140,7 +140,7 @@ static void process_args(int argc, char **argv)
 	int opt;
 
 	while ((opt = getopt(argc, argv,
-			     "a:A:b:cC:d:D:e:Ef:Fk:K:ln:p:O:rR:qsT:vVx")) != -1) {
+			     "a:A:b:c:C:d:D:e:Ef:Fk:K:ln:p:O:rR:qsT:vVx")) != -1) {
 		switch (opt) {
 		case 'a':
 			params.addr = strtoull(optarg, &ptr, 16);