diff --git a/include/spdk/nvmf.h b/include/spdk/nvmf.h
index 0f183eb13..a4c57163e 100644
--- a/include/spdk/nvmf.h
+++ b/include/spdk/nvmf.h
@@ -558,7 +558,7 @@ struct spdk_nvmf_host *spdk_nvmf_subsystem_get_next_host(struct spdk_nvmf_subsys
  *
  * \return NQN of host.
  */
-const char *spdk_nvmf_host_get_nqn(struct spdk_nvmf_host *host);
+const char *spdk_nvmf_host_get_nqn(const struct spdk_nvmf_host *host);
 
 /**
  * Accept new connections on the address provided.
@@ -845,7 +845,7 @@ int spdk_nvmf_subsystem_set_mn(struct spdk_nvmf_subsystem *subsystem, const char
  *
  * \return NQN of the specified subsystem.
  */
-const char *spdk_nvmf_subsystem_get_nqn(struct spdk_nvmf_subsystem *subsystem);
+const char *spdk_nvmf_subsystem_get_nqn(const struct spdk_nvmf_subsystem *subsystem);
 
 /**
  * Get the type of the specified subsystem.
diff --git a/lib/nvmf/subsystem.c b/lib/nvmf/subsystem.c
index 512d63873..2600ede90 100644
--- a/lib/nvmf/subsystem.c
+++ b/lib/nvmf/subsystem.c
@@ -727,7 +727,7 @@ spdk_nvmf_subsystem_get_next_host(struct spdk_nvmf_subsystem *subsystem,
 }
 
 const char *
-spdk_nvmf_host_get_nqn(struct spdk_nvmf_host *host)
+spdk_nvmf_host_get_nqn(const struct spdk_nvmf_host *host)
 {
 	return host->nqn;
 }
@@ -1318,7 +1318,7 @@ spdk_nvmf_subsystem_set_mn(struct spdk_nvmf_subsystem *subsystem, const char *mn
 }
 
 const char *
-spdk_nvmf_subsystem_get_nqn(struct spdk_nvmf_subsystem *subsystem)
+spdk_nvmf_subsystem_get_nqn(const struct spdk_nvmf_subsystem *subsystem)
 {
 	return subsystem->subnqn;
 }
diff --git a/test/unit/lib/nvmf/ctrlr_bdev.c/ctrlr_bdev_ut.c b/test/unit/lib/nvmf/ctrlr_bdev.c/ctrlr_bdev_ut.c
index c62e4bf3f..ddaefa46b 100644
--- a/test/unit/lib/nvmf/ctrlr_bdev.c/ctrlr_bdev_ut.c
+++ b/test/unit/lib/nvmf/ctrlr_bdev.c/ctrlr_bdev_ut.c
@@ -162,7 +162,7 @@ DEFINE_STUB(spdk_bdev_nvme_io_passthru, int,
 DEFINE_STUB_V(spdk_bdev_free_io, (struct spdk_bdev_io *bdev_io));
 
 DEFINE_STUB(spdk_nvmf_subsystem_get_nqn, const char *,
-	    (struct spdk_nvmf_subsystem *subsystem), NULL);
+	    (const struct spdk_nvmf_subsystem *subsystem), NULL);
 
 struct spdk_nvmf_ns *
 spdk_nvmf_subsystem_get_ns(struct spdk_nvmf_subsystem *subsystem, uint32_t nsid)