diff --git a/src/libstrongswan/crypto/diffie_hellman.c b/src/libstrongswan/crypto/diffie_hellman.c
index 7b33ae4ed..605892e87 100644
--- a/src/libstrongswan/crypto/diffie_hellman.c
+++ b/src/libstrongswan/crypto/diffie_hellman.c
@@ -531,6 +531,7 @@ static void destroy(private_diffie_hellman_t *this)
 	mpz_clear(this->ya);
 	mpz_clear(this->yb);
 	mpz_clear(this->zz);
+	mpz_clear(this->g);
 	free(this);
 }