diff --git a/source/pack.c b/source/pack.c
index 8071908..dc40703 100644
--- a/source/pack.c
+++ b/source/pack.c
@@ -69,7 +69,7 @@ int do_pack(int argc, char *argv[])
 {
 	char data[4096];
 	struct rots_hdr hdr;
-	struct args args;
+	struct args args = { 0 };
 	FILE *input, *output;
 	size_t nbytes, size;
 
diff --git a/source/sign.c b/source/sign.c
index 3385a52..41f3258 100644
--- a/source/sign.c
+++ b/source/sign.c
@@ -186,7 +186,7 @@ void show_sign_usage(const char *prog_name, const char *cmd)
 
 int do_sign(int argc, char *argv[])
 {
-	struct args args;
+	struct args args = { 0 };
 	EVP_PKEY *key;
 	X509 *cert;
 	char *cn;
diff --git a/source/unpack.c b/source/unpack.c
index bf7fbdc..9c6c8aa 100644
--- a/source/unpack.c
+++ b/source/unpack.c
@@ -64,11 +64,9 @@ int do_unpack(int argc, char *argv[])
 	char data[512];
 	struct rots_hdr hdr;
 	FILE *in, *out;
-	struct args args;
+	struct args args = { 0 };
 	size_t nbytes, size;
 
-	memset(&args, 0, sizeof args);
-
 	if (parse_args(&args, argc, argv) < 0) {
 		show_unpack_usage(argv[0], argv[1]);
 		return -1;
diff --git a/source/verify.c b/source/verify.c
index 939d0bd..c146fcc 100644
--- a/source/verify.c
+++ b/source/verify.c
@@ -240,7 +240,7 @@ void show_verify_usage(const char *prog_name, const char *cmd)
 
 int do_verify(int argc, char *argv[])
 {
-	struct args args;
+	struct args args = { 0 };
 	size_t count, total;
 
 	if (parse_args(&args, argc, argv) < 0) {