diff --git a/cs677/pa4/maximum-parsimony.cc b/cs677/pa4/maximum-parsimony.cc
index 70b4934..a26458f 100644
--- a/cs677/pa4/maximum-parsimony.cc
+++ b/cs677/pa4/maximum-parsimony.cc
@@ -108,9 +108,16 @@ int main(int argc, char * argv[])
     /* after all processes have evaluated their trees, figure out
      * which process discovered the lowest cost tree */
     int processes_lowest_costs[world_size];
-    MPI_Gather(&lowest_cost, 1, MPI_INT,
-               &processes_lowest_costs[0], world_size, MPI_INT,
-               0, MPI_COMM_WORLD);
+    int recvcnts[world_size];
+    int displs[world_size];
+    for (int i = 0; i < world_size; i++)
+    {
+        recvcnts[i] = 1;
+        displs[i] = i;
+    }
+    MPI_Gatherv(&lowest_cost, 1, MPI_INT,
+                &processes_lowest_costs[0], &recvcnts[0], &displs[0],
+                MPI_INT, 0, MPI_COMM_WORLD);
     int min_process = 0;
     if (my_rank == 0)
     {