diff --git a/external/unbound/libunbound/libunbound.c b/external/unbound/libunbound/libunbound.c
index 91a663a7..af2ca0d3 100644
--- a/external/unbound/libunbound/libunbound.c
+++ b/external/unbound/libunbound/libunbound.c
@@ -1028,7 +1028,6 @@ ub_ctx_hosts(struct ub_ctx* ctx, const char* fname)
 					"\\hosts");
 				retval=ub_ctx_hosts(ctx, buf);
 			}
-			free(name);
 			return retval;
 		}
 		return UB_READFILE;
diff --git a/src/common/dns_utils.cpp b/src/common/dns_utils.cpp
index 4ab93cce..2ac49bf4 100644
--- a/src/common/dns_utils.cpp
+++ b/src/common/dns_utils.cpp
@@ -162,11 +162,9 @@ DNSResolver::DNSResolver() : m_data(new DNSResolverData())
   // init libunbound context
   m_data->m_ub_context = ub_ctx_create();
 
-  char empty_string = '\0';
-
   // look for "/etc/resolv.conf" and "/etc/hosts" or platform equivalent
-  ub_ctx_resolvconf(m_data->m_ub_context, &empty_string);
-  ub_ctx_hosts(m_data->m_ub_context, &empty_string);
+  ub_ctx_resolvconf(m_data->m_ub_context, NULL);
+  ub_ctx_hosts(m_data->m_ub_context, NULL);
 
   ub_ctx_add_ta(m_data->m_ub_context, ::get_builtin_ds());
 }