diff --git a/tools/mkimage.c b/tools/mkimage.c
index d993958..3c594a0 100644
--- a/tools/mkimage.c
+++ b/tools/mkimage.c
@@ -140,7 +140,7 @@
 	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);