c3-lang/libtommath

diff --git a/bn_mp_init_copy.c b/bn_mp_init_copy.c
index 9e15f36..76c5e42 100644
--- a/bn_mp_init_copy.c
+++ b/bn_mp_init_copy.c
@@ -23,7 +23,12 @@ int mp_init_copy (mp_int * a, mp_int * b)
   if ((res = mp_init_size (a, b->used)) != MP_OKAY) {
     return res;
   }
-  return mp_copy (b, a);
+
+  if((res = mp_copy (b, a)) != MP_OKAY) {
+    mp_clear(a);
+  }
+
+  return res;
 }
 #endif