diff --git a/src/crypto/crypto.cpp b/src/crypto/crypto.cpp
index f5f5257..1f45e45 100644
--- a/src/crypto/crypto.cpp
+++ b/src/crypto/crypto.cpp
@@ -217,11 +217,11 @@ DISABLE_VS_WARNINGS(4200)
     struct {
       ec_point a, b;
     } ab[];
-  };
+  } rcs;
 POP_WARNINGS
 
   static inline size_t rs_comm_size(size_t pubs_count) {
-    return sizeof(rs_comm) + pubs_count * sizeof(rs_comm().ab[0]);
+    return sizeof(rs_comm) + pubs_count * sizeof(rcs.ab[0]);
   }
 
   void crypto_ops::generate_ring_signature(const hash &prefix_hash, const key_image &image,