diff --git a/configure.ac b/configure.ac
index d8402fe48..ae8ddadc0 100644
--- a/configure.ac
+++ b/configure.ac
@@ -97,6 +97,7 @@ AC_CHECK_HEADERS([arpa/inet.h fcntl.h limits.h locale.h netdb.h netinet/in.h std
 AC_C_CONST
 AC_C_BIGENDIAN
 AC_C_INLINE
+AC_C_FLEXIBLE_ARRAY_MEMBER
 AC_TYPE_INTPTR_T
 AC_TYPE_PID_T
 AC_TYPE_SIZE_T
diff --git a/src/mod/dns.mod/coredns.c b/src/mod/dns.mod/coredns.c
index 056d733d4..1985a6013 100644
--- a/src/mod/dns.mod/coredns.c
+++ b/src/mod/dns.mod/coredns.c
@@ -151,7 +151,7 @@ typedef struct {
   uint16_t class;
   uint32_t ttl;
   uint16_t datalength;
-  uint8_t data[];
+  uint8_t data[FLEXIBLE_ARRAY_MEMBER];
 } res_record;
 
 #ifndef HFIXEDSZ