diff --git a/src/ImageSharp/Memory/ArrayPoolMemoryAllocator.cs b/src/ImageSharp/Memory/ArrayPoolMemoryAllocator.cs
index 32c1c6d1d8..f1921d2a0a 100644
--- a/src/ImageSharp/Memory/ArrayPoolMemoryAllocator.cs
+++ b/src/ImageSharp/Memory/ArrayPoolMemoryAllocator.cs
@@ -62,7 +62,7 @@ namespace SixLabors.Memory
         public ArrayPoolMemoryAllocator(int maxPoolSizeInBytes, int poolSelectorThresholdInBytes, int maxArraysPerBucketLargePool, int maxArraysPerBucketNormalPool)
         {
             ImageSharp.Guard.MustBeGreaterThan(maxPoolSizeInBytes, 0, nameof(maxPoolSizeInBytes));
-            Guard.MustBeLessThanOrEqualTo(poolSelectorThresholdInBytes, maxPoolSizeInBytes, nameof(poolSelectorThresholdInBytes));
+            ImageSharp.Guard.MustBeLessThanOrEqualTo(poolSelectorThresholdInBytes, maxPoolSizeInBytes, nameof(poolSelectorThresholdInBytes));
 
             this.MaxPoolSizeInBytes = maxPoolSizeInBytes;
             this.PoolSelectorThresholdInBytes = poolSelectorThresholdInBytes;
diff --git a/src/ImageSharp/Memory/BasicArrayBuffer.cs b/src/ImageSharp/Memory/BasicArrayBuffer.cs
index f40df76049..6cbaa0364c 100644
--- a/src/ImageSharp/Memory/BasicArrayBuffer.cs
+++ b/src/ImageSharp/Memory/BasicArrayBuffer.cs
@@ -38,7 +38,7 @@ namespace SixLabors.Memory
             [MethodImpl(MethodImplOptions.AggressiveInlining)]
             get
             {
-                DebugGuard.MustBeLessThan(index, this.Length, nameof(index));
+                ImageSharp.DebugGuard.MustBeLessThan(index, this.Length, nameof(index));
 
                 Span<T> span = this.GetSpan();
                 return ref span[index];
diff --git a/src/ImageSharp/Memory/Buffer2D{T}.cs b/src/ImageSharp/Memory/Buffer2D{T}.cs
index 844ca1ad10..1e05fef6d1 100644
--- a/src/ImageSharp/Memory/Buffer2D{T}.cs
+++ b/src/ImageSharp/Memory/Buffer2D{T}.cs
@@ -62,7 +62,7 @@ namespace SixLabors.Memory
             get
             {
                 ImageSharp.DebugGuard.MustBeLessThan(x, this.Width, nameof(x));
-                DebugGuard.MustBeLessThan(y, this.Height, nameof(y));
+                ImageSharp.DebugGuard.MustBeLessThan(y, this.Height, nameof(y));
                 Span<T> span = this.Span;
                 return ref span[(this.Width * y) + x];
             }
diff --git a/src/ImageSharp/Memory/BufferArea{T}.cs b/src/ImageSharp/Memory/BufferArea{T}.cs
index 6a2146fd20..d8e588dcfe 100644
--- a/src/ImageSharp/Memory/BufferArea{T}.cs
+++ b/src/ImageSharp/Memory/BufferArea{T}.cs
@@ -120,7 +120,7 @@ namespace SixLabors.Memory
         public BufferArea<T> GetSubArea(Rectangle rectangle)
         {
             ImageSharp.DebugGuard.MustBeLessThanOrEqualTo(rectangle.Width, this.Rectangle.Width, nameof(rectangle));
-            DebugGuard.MustBeLessThanOrEqualTo(rectangle.Height, this.Rectangle.Height, nameof(rectangle));
+            ImageSharp.DebugGuard.MustBeLessThanOrEqualTo(rectangle.Height, this.Rectangle.Height, nameof(rectangle));
 
             int x = this.Rectangle.X + rectangle.X;
             int y = this.Rectangle.Y + rectangle.Y;