diff --git a/FastRng/Double/Distributions/Beta.cs b/FastRng/Double/Distributions/Beta.cs
index a1fe3b0..d51a6cf 100644
--- a/FastRng/Double/Distributions/Beta.cs
+++ b/FastRng/Double/Distributions/Beta.cs
@@ -34,7 +34,7 @@ namespace FastRng.Double.Distributions
             }
         }
 
-        public async ValueTask<double> GetDistributedValue(CancellationToken token)
+        public async ValueTask<double> GetDistributedValue(CancellationToken token = default)
         {
             if (this.Random == null)
                 return System.Double.NaN;
diff --git a/FastRng/Double/Distributions/Cauchy.cs b/FastRng/Double/Distributions/Cauchy.cs
index 088d85c..e5b75a1 100644
--- a/FastRng/Double/Distributions/Cauchy.cs
+++ b/FastRng/Double/Distributions/Cauchy.cs
@@ -24,7 +24,7 @@ namespace FastRng.Double.Distributions
 
         public double Median { get; set; } = 0.0;
 
-        public async ValueTask<double> GetDistributedValue(CancellationToken token)
+        public async ValueTask<double> GetDistributedValue(CancellationToken token = default)
         {
             if (this.Random == null)
                 return System.Double.NaN;
diff --git a/FastRng/Double/Distributions/Gamma.cs b/FastRng/Double/Distributions/Gamma.cs
index f927207..f42d30f 100644
--- a/FastRng/Double/Distributions/Gamma.cs
+++ b/FastRng/Double/Distributions/Gamma.cs
@@ -26,7 +26,7 @@ namespace FastRng.Double.Distributions
 
         public double Scale { get; set; } = 1.0;
         
-        public async ValueTask<double> GetDistributedValue(CancellationToken token)
+        public async ValueTask<double> GetDistributedValue(CancellationToken token = default)
         {
             if (this.Random == null)
                 return System.Double.NaN;