1 files changed, 4 insertions, 2 deletions
diff --git a/erts/emulator/beam/erl_trace.c b/erts/emulator/beam/erl_trace.c
index ae7084b7f4..c85a7df5ec 100644
--- a/erts/emulator/beam/erl_trace.c
+++ b/erts/emulator/beam/erl_trace.c
@@ -635,9 +635,11 @@ write_sys_msg_to_port(Eterm unused_to,
 		      Eterm message) {
     byte *buffer;
     byte *ptr;
-    unsigned size;
+    Uint size;
+
+    if (erts_encode_ext_size(message, &size) != ERTS_EXT_SZ_OK)
+	erts_exit(ERTS_ERROR_EXIT, "Internal error: System limit\n");
 
-    size = erts_encode_ext_size(message);
     buffer = (byte *) erts_alloc(ERTS_ALC_T_TMP, size);
 
     ptr = buffer;