diff --git a/src/hooks/dhcp/mysql_cb/mysql_cb_dhcp4.cc b/src/hooks/dhcp/mysql_cb/mysql_cb_dhcp4.cc
index de9f5ee6ba..b9e3b19462 100644
--- a/src/hooks/dhcp/mysql_cb/mysql_cb_dhcp4.cc
+++ b/src/hooks/dhcp/mysql_cb/mysql_cb_dhcp4.cc
@@ -2941,7 +2941,7 @@ MySqlConfigBackendDHCPv4::deleteSharedNetworkSubnets4(const db::ServerSelector&
                                                       const std::string& shared_network_name) {
     if (!server_selector.amAny()) {
         isc_throw(InvalidOperation, "deleting all subnets from a shared "
-                  "network is defined only using ANY server");
+                  "network requires using ANY server selector");
     }
     LOG_DEBUG(mysql_cb_logger, DBGLVL_TRACE_BASIC, MYSQL_CB_DELETE_SHARED_NETWORK_SUBNETS4)
         .arg(shared_network_name);
diff --git a/src/hooks/dhcp/mysql_cb/mysql_cb_dhcp6.cc b/src/hooks/dhcp/mysql_cb/mysql_cb_dhcp6.cc
index 2e4ae9d149..6b8fdfde18 100644
--- a/src/hooks/dhcp/mysql_cb/mysql_cb_dhcp6.cc
+++ b/src/hooks/dhcp/mysql_cb/mysql_cb_dhcp6.cc
@@ -3321,7 +3321,7 @@ MySqlConfigBackendDHCPv6::deleteSharedNetworkSubnets6(const db::ServerSelector&
                                                       const std::string& shared_network_name) {
     if (!server_selector.amAny()) {
         isc_throw(InvalidOperation, "deleting all subnets from a shared "
-                  "network is defined only using ANY server");
+                  "network requires using ANY server selector");
     }
     LOG_DEBUG(mysql_cb_logger, DBGLVL_TRACE_BASIC, MYSQL_CB_DELETE_SHARED_NETWORK_SUBNETS6)
         .arg(shared_network_name);
diff --git a/src/hooks/dhcp/mysql_cb/tests/mysql_cb_dhcp4_unittest.cc b/src/hooks/dhcp/mysql_cb/tests/mysql_cb_dhcp4_unittest.cc
index 9c7a4a8944..f562bf1a77 100644
--- a/src/hooks/dhcp/mysql_cb/tests/mysql_cb_dhcp4_unittest.cc
+++ b/src/hooks/dhcp/mysql_cb/tests/mysql_cb_dhcp4_unittest.cc
@@ -2231,6 +2231,19 @@ TEST_F(MySqlConfigBackendDHCPv4Test, getAllSharedNetworks4) {
     EXPECT_EQ(0, cbptr_->deleteAllSharedNetworks4(ServerSelector::ONE("server1")));
 
     // Delete first shared network with it subnets and verify it is gone.
+    // It requires ANY so verifies that all other choices throw.
+    EXPECT_THROW(cbptr_->deleteSharedNetworkSubnets4(ServerSelector::UNASSIGNED(),
+                                                     test_networks_[1]->getName()),
+                 isc::InvalidOperation);
+    EXPECT_THROW(cbptr_->deleteSharedNetworkSubnets4(ServerSelector::ALL(),
+                                                     test_networks_[1]->getName()),
+                 isc::InvalidOperation);
+    EXPECT_THROW(cbptr_->deleteSharedNetworkSubnets4(ServerSelector::ONE("server1"),
+                                                     test_networks_[1]->getName()),
+                 isc::InvalidOperation);
+    EXPECT_THROW(cbptr_->deleteSharedNetworkSubnets4(ServerSelector::MULTIPLE({ "server1", "server2" }),
+                                                     test_networks_[1]->getName()),
+                 isc::InvalidOperation);
 
     // Begin by its subnet.
     EXPECT_EQ(1, cbptr_->deleteSharedNetworkSubnets4(ServerSelector::ANY(),
diff --git a/src/hooks/dhcp/mysql_cb/tests/mysql_cb_dhcp6_unittest.cc b/src/hooks/dhcp/mysql_cb/tests/mysql_cb_dhcp6_unittest.cc
index 705b81ddf5..b5fdc39c00 100644
--- a/src/hooks/dhcp/mysql_cb/tests/mysql_cb_dhcp6_unittest.cc
+++ b/src/hooks/dhcp/mysql_cb/tests/mysql_cb_dhcp6_unittest.cc
@@ -2246,6 +2246,19 @@ TEST_F(MySqlConfigBackendDHCPv6Test, getAllSharedNetworks6) {
     EXPECT_EQ(0, cbptr_->deleteAllSharedNetworks6(ServerSelector::ONE("server1")));
 
     // Delete first shared network with it subnets and verify it is gone.
+    // It requires ANY so verifies that all other choices throw.
+    EXPECT_THROW(cbptr_->deleteSharedNetworkSubnets6(ServerSelector::UNASSIGNED(),
+                                                     test_networks_[1]->getName()),
+                 isc::InvalidOperation);
+    EXPECT_THROW(cbptr_->deleteSharedNetworkSubnets6(ServerSelector::ALL(),
+                                                     test_networks_[1]->getName()),
+                 isc::InvalidOperation);
+    EXPECT_THROW(cbptr_->deleteSharedNetworkSubnets6(ServerSelector::ONE("server1"),
+                                                     test_networks_[1]->getName()),
+                 isc::InvalidOperation);
+    EXPECT_THROW(cbptr_->deleteSharedNetworkSubnets6(ServerSelector::MULTIPLE({ "server1", "server2" }),
+                                                     test_networks_[1]->getName()),
+                 isc::InvalidOperation);
 
     // Begin by its subnet.
     EXPECT_EQ(1, cbptr_->deleteSharedNetworkSubnets6(ServerSelector::ANY(),