diff --git a/src/lms.c b/src/lms.c
index 73065ed3..239e6e67 100644
--- a/src/lms.c
+++ b/src/lms.c
@@ -725,7 +725,7 @@ int lms_signature_print(FILE *fp, int fmt, int ind, const char *label, const uin
 		return -1;
 	}
 	q = GETU32(sig);
-	format_print(fp, fmt, ind, "q: %zu\n", q);
+	format_print(fp, fmt, ind, "q: %"PRIu32"\n", q);
 	sig += 4;
 	siglen -= 4;
 
diff --git a/src/skf/skf.c b/src/skf/skf.c
index 08fed460..f726fb68 100755
--- a/src/skf/skf.c
+++ b/src/skf/skf.c
@@ -364,7 +364,7 @@ int skf_list_apps(SKF_DEVICE *dev, int fmt, int ind, const char *label, FILE *fp
 
 		(void)format_print(fp, fmt, ind, "Application %d:\n", i);
 		(void)format_print(fp, fmt, ind + 4, "ApplicationName", name);
-		(void)format_print(fp, fmt, ind + 4, "AdminPinMaxRetry: %s\n", adminMaxRetry);
+		(void)format_print(fp, fmt, ind + 4, "AdminPinMaxRetry: %u\n", adminMaxRetry);
 		(void)format_print(fp, fmt, ind + 4, "AdminPinMinRetry: %u\n", adminMinRetry);
 		(void)format_print(fp, fmt, ind + 4, "AdminDefaultPin: %s\n", adminDefaultPin ? "True" : "False");
 		(void)format_print(fp, fmt, ind + 4, "UserPinMaxRetry: %u\n", userMaxRetry);
diff --git a/src/tls13.c b/src/tls13.c
index 5698bb55..3c96340c 100644
--- a/src/tls13.c
+++ b/src/tls13.c
@@ -350,7 +350,7 @@ Derive-Secret(Secret, Label, Messages) =
 */
 int tls13_derive_secret(const uint8_t secret[32], const char *label, const DIGEST_CTX *dgst_ctx, uint8_t out[32])
 {
-	DIGEST_CTX ctx = *dgst_ctx;
+	DIGEST_CTX ctx;
 	size_t outlen = 32;
 	uint8_t context[32];
 	size_t context_len;
@@ -359,6 +359,8 @@ int tls13_derive_secret(const uint8_t secret[32], const char *label, const DIGES
 		error_print();
 		return -1;
 	}
+
+ 	ctx = *dgst_ctx;
 	if (digest_finish(&ctx, context, &context_len) != 1) {
 		error_print();
 		return -1;
diff --git a/src/tls_trace.c b/src/tls_trace.c
index fe278685..0f0ece76 100644
--- a/src/tls_trace.c
+++ b/src/tls_trace.c
@@ -977,7 +977,7 @@ int tls_handshake_print(FILE *fp, const uint8_t *handshake, size_t handshakelen,
 		error_print();
 		return -1;
 	}
-	format_print(fp, format, indent, "Length: %zu\n", datalen);
+	format_print(fp, format, indent, "Length: %"PRIu32"\n", datalen);
 
 	if (tls_array_from_bytes(&data, datalen, &cp, &handshakelen) != 1) {
 		error_print();
diff --git a/src/x509_crl.c b/src/x509_crl.c
index 37746b13..5de83f6b 100644
--- a/src/x509_crl.c
+++ b/src/x509_crl.c
@@ -344,7 +344,7 @@ int x509_crl_entry_ext_from_der_ex(int *oid, int *critical,
 			error_print();
 			return -1;
 		}
-		if (!cert_issuer) {
+		if (!(*cert_issuer)) {
 			error_print();
 			return -1;
 		}
diff --git a/src/xmss.c b/src/xmss.c
index 0124995c..bab62f40 100644
--- a/src/xmss.c
+++ b/src/xmss.c
@@ -1091,12 +1091,12 @@ int xmss_signature_print_ex(FILE *fp, int fmt, int ind, const char *label, const
 	format_bytes(fp, fmt, ind, "random", sig->random, 32);
 	format_print(fp, fmt, ind, "wots_sig\n");
 	for (i = 0; i < 67; i++) {
-		format_print(fp, fmt, ind+4, "%d", i);
+		format_print(fp, fmt, ind+4, "%zu", i);
 		format_bytes(fp, fmt, 0, "", sig->wots_sig[i], 32);
 	}
 	format_print(fp, fmt, ind, "auth_path\n");
 	for (i = 0; i < height; i++) {
-		format_print(fp, fmt, ind+4, "%d", i);
+		format_print(fp, fmt, ind+4, "%zu", i);
 		format_bytes(fp, fmt, 0, "", sig->auth_path[i], 32);
 	}
 	return 1;
@@ -1909,7 +1909,7 @@ int xmssmt_private_key_print(FILE *fp, int fmt, int ind, const char *label, cons
 	xmssmt_public_key_print(fp, fmt, ind, "public_key", key);
 	format_bytes(fp, fmt, ind, "secret", key->secret, 32);
 	format_bytes(fp, fmt, ind, "sk_prf", key->sk_prf, 32);
-	format_print(fp, fmt, ind, "index: %u\n", key->index);
+	format_print(fp, fmt, ind, "index: %"PRIu64"\n", key->index);
 
 	if (xmssmt_type_to_height_and_layers(key->public_key.xmssmt_type, &height, &layers) != 1) {
 		error_print();
@@ -2147,13 +2147,13 @@ int xmssmt_signature_print_ex(FILE *fp, int fmt, int ind, const char *label, con
 		format_print(fp, fmt, ind, "redurced_xmss_signature[%zu]\n", layer);
 		format_print(fp, fmt, ind+4, "wots_sig\n");
 		for (i = 0; i < 67; i++) {
-			format_print(fp, fmt, ind+8, "%d", i);
+			format_print(fp, fmt, ind+8, "%zu", i);
 			format_bytes(fp, fmt, 0, "", sig->wots_sigs[layer][i], 32);
 		}
 
 		format_print(fp, fmt, ind+4, "auth_path\n");
 		for (i = 0; i < height/layers; i++) {
-			format_print(fp, fmt, ind+8, "%d", i);
+			format_print(fp, fmt, ind+8, "%zu", i);
 			format_bytes(fp, fmt, 0, "", sig->auth_path[(height/layers) * layer + i], 32);
 		}
 	}
@@ -2195,7 +2195,7 @@ int xmssmt_signature_print(FILE *fp, int fmt, int ind, const char *label, const
 		format_print(fp, fmt, ind, "redurced_xmss_signature[%zu]\n", layer);
 		format_print(fp, fmt, ind+4, "wots_sig\n");
 		for (i = 0; i < 67; i++) {
-			format_print(fp, fmt, ind+4, "%d ", i);
+			format_print(fp, fmt, ind+4, "%zu ", i);
 			if (siglen < sizeof(xmss_hash256_t)) {
 				error_print();
 				return -1;
@@ -2206,7 +2206,7 @@ int xmssmt_signature_print(FILE *fp, int fmt, int ind, const char *label, const
 		}
 		format_print(fp, fmt, ind+4, "auth_path\n");
 		for (i = 0; i < height/layers; i++) {
-			format_print(fp, fmt, ind+8, "%d ", i);
+			format_print(fp, fmt, ind+8, "%zu ", i);
 			if (siglen < sizeof(xmss_hash256_t)) {
 				error_print();
 				return -1;