diff --git a/src/ImageSharp/IO/BigEndianBitConverter.cs b/src/ImageSharp/IO/BigEndianBitConverter.cs
index 6b5cf3b9c..2fcfd966c 100644
--- a/src/ImageSharp/IO/BigEndianBitConverter.cs
+++ b/src/ImageSharp/IO/BigEndianBitConverter.cs
@@ -78,7 +78,7 @@ namespace SixLabors.ImageSharp.IO
 
             long p1 = (value[startIndex] << 24) | (value[startIndex + 1] << 16) | (value[startIndex + 2] << 8) | value[startIndex + 3];
             long p2 = (value[startIndex + 4] << 24) | (value[startIndex + 5] << 16) | (value[startIndex + 6] << 8) | value[startIndex + 7];
-            return p2 | (p1 << 32);
+            return (p2 & 0xFFFFFFFF) | (p1 << 32);
         }
     }
 }
\ No newline at end of file
diff --git a/src/ImageSharp/IO/LittleEndianBitConverter.cs b/src/ImageSharp/IO/LittleEndianBitConverter.cs
index 712bfd97b..a69831586 100644
--- a/src/ImageSharp/IO/LittleEndianBitConverter.cs
+++ b/src/ImageSharp/IO/LittleEndianBitConverter.cs
@@ -75,7 +75,7 @@ namespace SixLabors.ImageSharp.IO
             CheckByteArgument(value, startIndex, 8);
             long p1 = (value[startIndex + 7] << 24) | (value[startIndex + 6] << 16) | (value[startIndex + 5] << 8) | value[startIndex + 4];
             long p2 = (value[startIndex + 3] << 24) | (value[startIndex + 2] << 16) | (value[startIndex + 1] << 8) | value[startIndex];
-            return p2 | (p1 << 32);
+            return (p2 & 0xFFFFFFFF) | (p1 << 32);
         }
     }
 }
\ No newline at end of file
diff --git a/tests/ImageSharp.Tests/IO/BigEndianBitConverter.ToTypeTests.cs b/tests/ImageSharp.Tests/IO/BigEndianBitConverter.ToTypeTests.cs
index 65963918c..19ef24c79 100644
--- a/tests/ImageSharp.Tests/IO/BigEndianBitConverter.ToTypeTests.cs
+++ b/tests/ImageSharp.Tests/IO/BigEndianBitConverter.ToTypeTests.cs
@@ -164,6 +164,8 @@ namespace SixLabors.ImageSharp.Tests.IO
             Assert.Equal(1099511627776L * 256 * 256, EndianBitConverter.BigEndianConverter.ToInt64(new byte[] { 1, 0, 0, 0, 0, 0, 0, 0 }, 0));
             Assert.Equal(-1L, EndianBitConverter.BigEndianConverter.ToInt64(new byte[] { 255, 255, 255, 255, 255, 255, 255, 255 }, 0));
             Assert.Equal(257L, EndianBitConverter.BigEndianConverter.ToInt64(new byte[] { 0, 0, 0, 0, 0, 0, 1, 1 }, 0));
+            Assert.Equal(4294967295L, EndianBitConverter.BigEndianConverter.ToInt64(new byte[] { 0, 0, 0, 0, 255, 255, 255, 255 }, 0));
+            Assert.Equal(-4294967296L, EndianBitConverter.BigEndianConverter.ToInt64(new byte[] { 255, 255, 255, 255, 0, 0, 0, 0 }, 0));
 
             Assert.Equal(0L, EndianBitConverter.BigEndianConverter.ToInt64(new byte[] { 1, 0, 0, 0, 0, 0, 0, 0, 0 }, 1));
             Assert.Equal(1L, EndianBitConverter.BigEndianConverter.ToInt64(new byte[] { 1, 0, 0, 0, 0, 0, 0, 0, 1 }, 1));
@@ -176,6 +178,8 @@ namespace SixLabors.ImageSharp.Tests.IO
             Assert.Equal(1099511627776L * 256 * 256, EndianBitConverter.BigEndianConverter.ToInt64(new byte[] { 0, 1, 0, 0, 0, 0, 0, 0, 0 }, 1));
             Assert.Equal(-1L, EndianBitConverter.BigEndianConverter.ToInt64(new byte[] { 0, 255, 255, 255, 255, 255, 255, 255, 255 }, 1));
             Assert.Equal(257L, EndianBitConverter.BigEndianConverter.ToInt64(new byte[] { 1, 0, 0, 0, 0, 0, 0, 1, 1 }, 1));
+            Assert.Equal(4294967295L, EndianBitConverter.BigEndianConverter.ToInt64(new byte[] { 1, 0, 0, 0, 0, 255, 255, 255, 255 }, 1));
+            Assert.Equal(-4294967296L, EndianBitConverter.BigEndianConverter.ToInt64(new byte[] { 1, 255, 255, 255, 255, 0, 0, 0, 0 }, 1));
         }
 
         /// <summary>
diff --git a/tests/ImageSharp.Tests/IO/LittleEndianBitConverter.ToTypeTests.cs b/tests/ImageSharp.Tests/IO/LittleEndianBitConverter.ToTypeTests.cs
index f35836257..0e09d1d07 100644
--- a/tests/ImageSharp.Tests/IO/LittleEndianBitConverter.ToTypeTests.cs
+++ b/tests/ImageSharp.Tests/IO/LittleEndianBitConverter.ToTypeTests.cs
@@ -162,6 +162,8 @@ namespace SixLabors.ImageSharp.Tests.IO
             Assert.Equal(1099511627776L * 256 * 256, EndianBitConverter.LittleEndianConverter.ToInt64(new byte[] { 0, 0, 0, 0, 0, 0, 0, 1 }, 0));
             Assert.Equal(-1L, EndianBitConverter.LittleEndianConverter.ToInt64(new byte[] { 255, 255, 255, 255, 255, 255, 255, 255 }, 0));
             Assert.Equal(257L, EndianBitConverter.LittleEndianConverter.ToInt64(new byte[] { 1, 1, 0, 0, 0, 0, 0, 0 }, 0));
+            Assert.Equal(4294967295L, EndianBitConverter.LittleEndianConverter.ToInt64(new byte[] { 255, 255, 255, 255, 0, 0, 0, 0 }, 0));
+            Assert.Equal(-4294967296L, EndianBitConverter.LittleEndianConverter.ToInt64(new byte[] { 0, 0, 0, 0, 255, 255, 255, 255 }, 0));
 
             Assert.Equal(0L, EndianBitConverter.LittleEndianConverter.ToInt64(new byte[] { 1, 0, 0, 0, 0, 0, 0, 0, 0 }, 1));
             Assert.Equal(1L, EndianBitConverter.LittleEndianConverter.ToInt64(new byte[] { 0, 1, 0, 0, 0, 0, 0, 0, 0 }, 1));
@@ -174,6 +176,8 @@ namespace SixLabors.ImageSharp.Tests.IO
             Assert.Equal(1099511627776L * 256 * 256, EndianBitConverter.LittleEndianConverter.ToInt64(new byte[] { 1, 0, 0, 0, 0, 0, 0, 0, 1 }, 1));
             Assert.Equal(-1L, EndianBitConverter.LittleEndianConverter.ToInt64(new byte[] { 0, 255, 255, 255, 255, 255, 255, 255, 255 }, 1));
             Assert.Equal(257L, EndianBitConverter.LittleEndianConverter.ToInt64(new byte[] { 0, 1, 1, 0, 0, 0, 0, 0, 0 }, 1));
+            Assert.Equal(4294967295L, EndianBitConverter.LittleEndianConverter.ToInt64(new byte[] { 0, 255, 255, 255, 255, 0, 0, 0, 0 }, 1));
+            Assert.Equal(-4294967296L, EndianBitConverter.LittleEndianConverter.ToInt64(new byte[] { 0, 0, 0, 0, 0, 255, 255, 255, 255 }, 1));
         }
 
         /// <summary>
diff --git a/tests/ImageSharp.Tests/TestUtilities/Tests/TestEnvironmentTests.cs b/tests/ImageSharp.Tests/TestUtilities/Tests/TestEnvironmentTests.cs
index 658fa862d..25584727a 100644
--- a/tests/ImageSharp.Tests/TestUtilities/Tests/TestEnvironmentTests.cs
+++ b/tests/ImageSharp.Tests/TestUtilities/Tests/TestEnvironmentTests.cs
@@ -44,12 +44,6 @@ namespace SixLabors.ImageSharp.Tests
             this.CheckPath(TestEnvironment.InputImagesDirectoryFullPath);
         }
 
-        [Fact]
-        public void ActualOutputDirectoryFullPath()
-        {
-            this.CheckPath(TestEnvironment.ActualOutputDirectoryFullPath);
-        }
-
         [Fact]
         public void ExpectedOutputDirectoryFullPath()
         {