diff --git a/SurveyLib.Infrastructure.EFCore/Data/SurveyDbContext.cs b/SurveyLib.Infrastructure.EFCore/Data/SurveyDbContext.cs
index d77fb6d..f505684 100644
--- a/SurveyLib.Infrastructure.EFCore/Data/SurveyDbContext.cs
+++ b/SurveyLib.Infrastructure.EFCore/Data/SurveyDbContext.cs
@@ -16,7 +16,12 @@ public class SurveyDbContext : DbContext
     public DbSet<Completion> Completions { get; set; }
     public DbSet<Answer> Answers { get; set; }
 
-    public SurveyDbContext(DbContextOptions<SurveyDbContext> options) : base(options)
+    public SurveyDbContext(DbContextOptions options) : base(options)
     {
     }
+
+    protected override void OnModelCreating(ModelBuilder modelBuilder)
+    {
+        modelBuilder.Entity<Answer>().HasKey(a => new { a.CompletionId, a.QuestionId });
+    }
 }
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