diff --git a/setup.py b/setup.py
index 8ef88d12dd382cd1f3624122493bcdd1dbe07629..cb966e8469700a80663079eea6b8ee1708cc5cb7 100644
--- a/setup.py
+++ b/setup.py
@@ -50,6 +50,7 @@ setup(
                  "DTLSSocket/tinydtls/crypto.c",
                  "DTLSSocket/tinydtls/dtls.c",
                  "DTLSSocket/tinydtls/dtls_debug.c",
+                 "DTLSSocket/tinydtls/ecc/ecc.c",
                  "DTLSSocket/tinydtls/dtls_time.c",
                  "DTLSSocket/tinydtls/hmac.c",
                  "DTLSSocket/tinydtls/netq.c",