diff --git a/src/libraries/System.IO.Compression/ref/System.IO.Compression.cs b/src/libraries/System.IO.Compression/ref/System.IO.Compression.cs
index fbea7ccd916a70..1d1b0414803b91 100644
--- a/src/libraries/System.IO.Compression/ref/System.IO.Compression.cs
+++ b/src/libraries/System.IO.Compression/ref/System.IO.Compression.cs
@@ -20,7 +20,9 @@ public enum CompressionMode
     }
     public partial class DeflateStream : System.IO.Stream
     {
+#if DEBUG
         public DeflateStream(System.IO.Stream stream, System.IO.Compression.CompressionLevel compressionLevel) { }
+#endif
         public DeflateStream(System.IO.Stream stream, System.IO.Compression.CompressionLevel compressionLevel, bool leaveOpen) { }
         public DeflateStream(System.IO.Stream stream, System.IO.Compression.CompressionMode mode) { }
         public DeflateStream(System.IO.Stream stream, System.IO.Compression.CompressionMode mode, bool leaveOpen) { }