diff --git a/lib/dns/ecdb.c b/lib/dns/ecdb.c
index 6a5a2c90d2..1c258c6516 100644
--- a/lib/dns/ecdb.c
+++ b/lib/dns/ecdb.c
@@ -745,7 +745,6 @@ rdatasetiter_destroy(dns_rdatasetiter_t **iteratorp) {
 	REQUIRE(iteratorp != NULL);
 	REQUIRE(DNS_RDATASETITER_VALID(*iteratorp));
 
-	/* cppcheck-suppress unreadVariable */
 	u.rdatasetiterator = *iteratorp;
 	*iteratorp = NULL;
 
diff --git a/lib/dns/openssldh_link.c b/lib/dns/openssldh_link.c
index ff14c7e956..af6e335005 100644
--- a/lib/dns/openssldh_link.c
+++ b/lib/dns/openssldh_link.c
@@ -243,7 +243,6 @@ progress_cb(int p, int n, BN_GENCB *cb) {
 
 	UNUSED(n);
 
-	/* cppcheck-suppress unreadVariable */
 	u.dptr = BN_GENCB_get_arg(cb);
 	if (u.fptr != NULL)
 		u.fptr(p);
@@ -304,7 +303,6 @@ openssldh_generate(dst_key_t *key, int generator, void (*callback)(int)) {
 		if (callback == NULL) {
 			BN_GENCB_set_old(cb, NULL, NULL);
 		} else {
-			/* cppcheck-suppress unreadVariable */
 			u.fptr = callback;
 			BN_GENCB_set(cb, progress_cb, u.dptr);
 		}
diff --git a/lib/dns/opensslrsa_link.c b/lib/dns/opensslrsa_link.c
index 1a61c9f366..0bd7558e5d 100644
--- a/lib/dns/opensslrsa_link.c
+++ b/lib/dns/opensslrsa_link.c
@@ -426,7 +426,6 @@ progress_cb(int p, int n, BN_GENCB *cb) {
 
 	UNUSED(n);
 
-	/* cppcheck-suppress unreadVariable */
 	u.dptr = BN_GENCB_get_arg(cb);
 	if (u.fptr != NULL)
 		u.fptr(p);
@@ -495,7 +494,6 @@ opensslrsa_generate(dst_key_t *key, int exp, void (*callback)(int)) {
 	if (callback == NULL) {
 		BN_GENCB_set_old(cb, NULL, NULL);
 	} else {
-		/* cppcheck-suppress unreadVariable */
 		u.fptr = callback;
 		BN_GENCB_set(cb, progress_cb, u.dptr);
 	}
diff --git a/lib/dns/rcode.c b/lib/dns/rcode.c
index 7dc51ee246..2853671d2c 100644
--- a/lib/dns/rcode.c
+++ b/lib/dns/rcode.c
@@ -361,7 +361,6 @@ dns_secalg_format(dns_secalg_t alg, char *cp, unsigned int size) {
 	isc_buffer_usedregion(&b, &r);
 	r.base[r.length] = 0;
 	if (result != ISC_R_SUCCESS) {
-		/* cppcheck-suppress unreadVariable */
 		r.base[0] = 0;
 	}
 }
@@ -461,7 +460,6 @@ dns_dsdigest_format(dns_dsdigest_t typ, char *cp, unsigned int size) {
 	isc_buffer_usedregion(&b, &r);
 	r.base[r.length] = 0;
 	if (result != ISC_R_SUCCESS) {
-		/* cppcheck-suppress unreadVariable */
 		r.base[0] = 0;
 	}
 }
diff --git a/lib/dns/ttl.c b/lib/dns/ttl.c
index ee33c00440..848ab0b701 100644
--- a/lib/dns/ttl.c
+++ b/lib/dns/ttl.c
@@ -121,7 +121,6 @@ dns_ttl_totext(uint32_t src, bool verbose,
 		 * here because region.base is type unsigned char *.
 		 */
 		isc_buffer_usedregion(target, &region);
-		/* cppcheck-suppress unreadVariable */
 		region.base[region.length - 1] =
 			toupper(region.base[region.length - 1]);
 	}
diff --git a/lib/isc/sockaddr.c b/lib/isc/sockaddr.c
index 8dd3125aa3..832be1c2ce 100644
--- a/lib/isc/sockaddr.c
+++ b/lib/isc/sockaddr.c
@@ -164,7 +164,6 @@ isc_sockaddr_totext(const isc_sockaddr_t *sockaddr, isc_buffer_t *target) {
 	 */
 	isc_buffer_availableregion(target, &avail);
 	INSIST(avail.length >= 1);
-	/* cppcheck-suppress unreadVariable */
 	avail.base[0] = '\0';
 
 	return (ISC_R_SUCCESS);
diff --git a/lib/isc/tests/random_test.c b/lib/isc/tests/random_test.c
index 43c499090f..556acffa4b 100644
--- a/lib/isc/tests/random_test.c
+++ b/lib/isc/tests/random_test.c
@@ -541,7 +541,6 @@ blockfrequency(isc_mem_t *mctx, uint16_t *values, size_t length) {
 
 	/* Preconditions (section 2.2.7 in NIST SP 800-22) */
 	assert_true(numbits >= 100);
-	/* cppcheck-suppress constArgument */
 	assert_true(mbits >= 20);
 	assert_true((double) mbits > (0.01 * numbits));
 	assert_true(numblocks < 100);
diff --git a/lib/isc/unix/resource.c b/lib/isc/unix/resource.c
index a00ae12565..1b8b945ef4 100644
--- a/lib/isc/unix/resource.c
+++ b/lib/isc/unix/resource.c
@@ -164,7 +164,6 @@ isc_resource_setlimit(isc_resource_t resource, isc_resourcevalue_t value) {
 			return (ISC_R_SUCCESS);
 	}
 #endif
-	/* cppcheck-suppress duplicateCondition */
 	if (resource == isc_resource_openfiles && rlim_value == RLIM_INFINITY) {
 		if (getrlimit(unixresource, &rl) == 0) {
 			rl.rlim_cur = rl.rlim_max;