diff --git a/src/wallet/wallet2.cpp b/src/wallet/wallet2.cpp
index 23fcf986..83d9d579 100644
--- a/src/wallet/wallet2.cpp
+++ b/src/wallet/wallet2.cpp
@@ -4179,7 +4179,7 @@ static size_t estimate_rct_tx_size(int n_inputs, int mixin, int n_outputs)
   size += (2*64*32+32+64*32) * n_outputs;
 
   // MGs
-  size += n_inputs * (32 * (mixin+1) + 32);
+  size += n_inputs * (64 * (mixin+1) + 32);
 
   // mixRing - not serialized, can be reconstructed
   /* size += 2 * 32 * (mixin+1) * n_inputs; */