diff --git a/prov/usnic/src/usdf.h b/prov/usnic/src/usdf.h
index 1daa1ff1665..841fe522ee8 100644
--- a/prov/usnic/src/usdf.h
+++ b/prov/usnic/src/usdf.h
@@ -81,6 +81,7 @@ extern struct fi_provider usdf_ops;
 
 #define USDF_MR_IOV_LIMIT 1
 #define USDF_ADDR_STR_LEN (INET6_ADDRSTRLEN+8)
+#define USDF_MR_CNT (65535)
 
 /*
  *  TAILQ stuff that should exist
diff --git a/prov/usnic/src/usdf_dgram.h b/prov/usnic/src/usdf_dgram.h
index 61728a537f9..66bb6aea3be 100644
--- a/prov/usnic/src/usdf_dgram.h
+++ b/prov/usnic/src/usdf_dgram.h
@@ -53,6 +53,7 @@
 #define USDF_DGRAM_RMA_IOV_LIMIT 0
 #define USDF_DGRAM_CNTR_CNT 0
 #define USDF_DGRAM_MR_IOV_LIMIT (USDF_MR_IOV_LIMIT)
+#define USDF_DGRAM_MR_CNT (USDF_MR_CNT)
 
 
 int usdf_dgram_fill_rx_attr(struct fi_info *hints,
diff --git a/prov/usnic/src/usdf_ep_dgram.c b/prov/usnic/src/usdf_ep_dgram.c
index 0173709ea12..30bb6e20cfb 100644
--- a/prov/usnic/src/usdf_ep_dgram.c
+++ b/prov/usnic/src/usdf_ep_dgram.c
@@ -438,6 +438,7 @@ static const struct fi_domain_attr dgram_dflt_domain_attr = {
 	.mr_mode = OFI_MR_BASIC_MAP | FI_MR_LOCAL,
 	.cntr_cnt = USDF_DGRAM_CNTR_CNT,
 	.mr_iov_limit = USDF_DGRAM_MR_IOV_LIMIT,
+	.mr_cnt = USDF_DGRAM_MR_CNT,
 };
 
 /*******************************************************************************
@@ -580,6 +581,13 @@ int usdf_dgram_fill_dom_attr(uint32_t version, struct fi_info *hints,
 		defaults.mr_mode = hints->domain_attr->mr_mode;
 	}
 
+	if (hints->domain_attr->mr_cnt <= USDF_DGRAM_MR_CNT) {
+		defaults.mr_cnt = hints->domain_attr->mr_cnt;
+	} else {
+		USDF_DBG_SYS(DOMAIN, "mr_count exceeded provider limit\n");
+		return -FI_ENODATA;
+	}
+
 out:
 	*fi->domain_attr = defaults;
 
diff --git a/prov/usnic/src/usdf_ep_msg.c b/prov/usnic/src/usdf_ep_msg.c
index 7a219dcdc8b..f634379a01b 100644
--- a/prov/usnic/src/usdf_ep_msg.c
+++ b/prov/usnic/src/usdf_ep_msg.c
@@ -120,6 +120,7 @@ static const struct fi_domain_attr msg_dflt_domain_attr = {
 	.mr_mode = OFI_MR_BASIC_MAP | FI_MR_LOCAL,
 	.cntr_cnt = USDF_MSG_CNTR_CNT,
 	.mr_iov_limit = USDF_MSG_MR_IOV_LIMIT,
+	.mr_cnt = USDF_MSG_MR_CNT,
 };
 
 static struct fi_ops_atomic usdf_msg_atomic_ops = {
@@ -261,6 +262,13 @@ int usdf_msg_fill_dom_attr(uint32_t version, struct fi_info *hints,
 		defaults.mr_mode = hints->domain_attr->mr_mode;
 	}
 
+	if (hints->domain_attr->mr_cnt <= USDF_MSG_MR_CNT) {
+		defaults.mr_cnt = hints->domain_attr->mr_cnt;
+	} else {
+		USDF_DBG_SYS(DOMAIN, "mr_count exceeded provider limit\n");
+		return -FI_ENODATA;
+	}
+
 out:
 	*fi->domain_attr = defaults;
 
diff --git a/prov/usnic/src/usdf_ep_rdm.c b/prov/usnic/src/usdf_ep_rdm.c
index b6e2183e44d..fbc5581ec35 100644
--- a/prov/usnic/src/usdf_ep_rdm.c
+++ b/prov/usnic/src/usdf_ep_rdm.c
@@ -123,6 +123,7 @@ static const struct fi_domain_attr rdm_dflt_domain_attr = {
 	.mr_mode = OFI_MR_BASIC_MAP | FI_MR_LOCAL,
 	.cntr_cnt = USDF_RDM_CNTR_CNT,
 	.mr_iov_limit = USDF_RDM_MR_IOV_LIMIT,
+	.mr_cnt = USDF_RDM_MR_CNT,
 };
 
 static struct fi_ops_atomic usdf_rdm_atomic_ops = {
@@ -264,6 +265,13 @@ int usdf_rdm_fill_dom_attr(uint32_t version, struct fi_info *hints,
 		defaults.mr_mode = hints->domain_attr->mr_mode;
 	}
 
+	if (hints->domain_attr->mr_cnt <= USDF_RDM_MR_CNT) {
+		defaults.mr_cnt = hints->domain_attr->mr_cnt;
+	} else {
+		USDF_DBG_SYS(DOMAIN, "mr_count exceeded provider limit\n");
+		return -FI_ENODATA;
+	}
+
 out:
 	*fi->domain_attr = defaults;
 
diff --git a/prov/usnic/src/usdf_msg.h b/prov/usnic/src/usdf_msg.h
index 690a0f58546..307e068c934 100644
--- a/prov/usnic/src/usdf_msg.h
+++ b/prov/usnic/src/usdf_msg.h
@@ -56,6 +56,7 @@
 #define USDF_MSG_IOV_LIMIT (USDF_MSG_DFLT_SGE)
 #define USDF_MSG_RMA_IOV_LIMIT 0
 #define USDF_MSG_MR_IOV_LIMIT (USDF_MR_IOV_LIMIT)
+#define USDF_MSG_MR_CNT (USDF_MR_CNT)
 
 #define USDF_MSG_CNTR_CNT 0
 
diff --git a/prov/usnic/src/usdf_rdm.h b/prov/usnic/src/usdf_rdm.h
index 19bb897e53b..6509e4a32db 100644
--- a/prov/usnic/src/usdf_rdm.h
+++ b/prov/usnic/src/usdf_rdm.h
@@ -56,6 +56,7 @@
 #define USDF_RDM_IOV_LIMIT (USDF_RDM_DFLT_SGE)
 #define USDF_RDM_RMA_IOV_LIMIT 0
 #define USDF_RDM_MR_IOV_LIMIT (USDF_MR_IOV_LIMIT)
+#define USDF_RDM_MR_CNT (USDF_MR_CNT)
 
 #define USDF_RDM_CNTR_CNT 0