diff --git a/internals.h b/internals.h
index 2b88b6f..2568dbc 100644
--- a/internals.h
+++ b/internals.h
@@ -147,18 +147,25 @@ struct BRANDT_Auction {
 	gcry_mpi_point_t **alpha;   /** alphas, size: n*k */
 	gcry_mpi_point_t **beta;    /** betas, size: n*k */
 
-	gcry_mpi_point_t **gamma2;  /** gamma2, for public outcome, size: n*k */
-	gcry_mpi_point_t ***gamma3; /** gamma3, for private outcome, size: n*n*k */
-	gcry_mpi_point_t **delta2;  /** delta2, for public outcome, size: n*k */
-	gcry_mpi_point_t ***delta3; /** delta3, for private outcome, size: n*n*k */
-	gcry_mpi_point_t **phi2;    /** phi2, for public outcome, size: n*k */
-	gcry_mpi_point_t ***phi3;   /** phi3, for private outcome, size: n*n*k */
+        union {
 
-	/** proofs for the correctnes of the phi values, size: n*k */
-	struct proof_2dle ***phiproofs2;
+          struct {
+  	    gcry_mpi_point_t **gamma2;  /** gamma2, for public outcome, size: n*k */
+	    gcry_mpi_point_t **delta2;  /** delta2, for public outcome, size: n*k */
+	    gcry_mpi_point_t **phi2;    /** phi2, for public outcome, size: n*k */
+            /** proofs for the correctnes of the phi values, size: n*k */
+            struct proof_2dle ***phiproofs2;
+          };
 
-	/** proofs for the correctnes of the phi values, size: n*n*k */
-	struct proof_2dle ***phiproofs3;
+          struct {
+            gcry_mpi_point_t ***gamma3; /** gamma3, for private outcome, size: n*n*k */
+            gcry_mpi_point_t ***delta3; /** delta3, for private outcome, size: n*n*k */
+            gcry_mpi_point_t ***phi3;   /** phi3, for private outcome, size: n*n*k */
+
+            /** proofs for the correctnes of the phi values, size: n*n*k */
+            struct proof_2dle ***phiproofs3;
+          };
+        };
 
 	gcry_mpi_point_t *tmpa1;    /** used for temporary storage, size: k */
 	gcry_mpi_point_t *tmpb1;    /** used for temporary storage, size: k */