diff --git a/test/ICSharpCode.SharpZipLib.Tests/Base/InflaterDeflaterTests.cs b/test/ICSharpCode.SharpZipLib.Tests/Base/InflaterDeflaterTests.cs
index 1d736558e..cf7b72456 100644
--- a/test/ICSharpCode.SharpZipLib.Tests/Base/InflaterDeflaterTests.cs
+++ b/test/ICSharpCode.SharpZipLib.Tests/Base/InflaterDeflaterTests.cs
@@ -104,12 +104,9 @@ private void RandomDeflateInflate(int size, int level, bool zlib)
 		/// </summary>
 		[Test]
 		[Category("Base")]
-		public void InflateDeflateZlib()
+		public void InflateDeflateZlib([Range(0, 9)] int level)
 		{
-			for (int level = 0; level < 10; ++level)
-			{
-				RandomDeflateInflate(100000, level, true);
-			}
+			RandomDeflateInflate(100000, level, true);
 		}
 
 		private delegate void RunCompress(byte[] buffer);
@@ -167,14 +164,12 @@ private void TryManyVariants(int level, bool zlib, RunCompress test, byte[] buff
 		/// </summary>
 		[Test]
 		[Category("Base")]
-		public void InflateDeflateNonZlib()
+		public void InflateDeflateNonZlib([Range(0, 9)] int level)
 		{
-			for (int level = 0; level < 10; ++level)
-			{
-				RandomDeflateInflate(100000, level, false);
-			}
+			RandomDeflateInflate(100000, level, false);
 		}
 
+
 		[Test]
 		[Category("Base")]
 		public void CloseDeflatorWithNestedUsing()