diff --git a/CMakeLists.txt b/CMakeLists.txt
index b28c71d..6a48143 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -204,6 +204,8 @@ include(CheckCSourceCompiles)
 set(CMAKE_REQUIRED_LIBRARIES "resolv")
 
 check_c_source_compiles("
+#include <sys/types.h>
+#include <netinet/in.h>
 #include <arpa/nameser.h>
 #include <resolv.h>
 #include <stdio.h>
@@ -235,6 +237,10 @@ int main(int argc, char* argv[])
 			int len = ns_rr_rdlen(rr) - 1;
 			if (len > data[0]) len = data[0];
 
+			if (len <= 0) {
+				continue;
+			}
+
 			char buf[256];
 			memcpy(buf, data + 1, len);
 			buf[len] = 0;
diff --git a/src/p2p_server.cpp b/src/p2p_server.cpp
index 93024a9..f61997a 100644
--- a/src/p2p_server.cpp
+++ b/src/p2p_server.cpp
@@ -34,6 +34,8 @@
 #ifdef _WIN32
 #include <WinDNS.h>
 #elif defined(HAVE_RES_QUERY)
+#include <sys/types.h>
+#include <netinet/in.h>
 #include <arpa/nameser.h>
 #include <resolv.h>
 #endif
@@ -528,6 +530,9 @@ void P2PServer::load_peer_list()
 							const uint8_t* data = ns_rr_rdata(rr);
 
 							const int len = std::min<int>(ns_rr_rdlen(rr) - 1, *data);
+							if (len <= 0) {
+								continue;
+							}
 							++data;
 
 							if (!saved_list.empty()) {