diff --git a/src/Avalonia.Build.Tasks/SpanCompat.cs b/src/Avalonia.Build.Tasks/SpanCompat.cs
index f8960f56ec..25f8d0175a 100644
--- a/src/Avalonia.Build.Tasks/SpanCompat.cs
+++ b/src/Avalonia.Build.Tasks/SpanCompat.cs
@@ -1,4 +1,4 @@
-#if !NETCOREAPP3_1
+#if !NETCOREAPP3_1_OR_GREATER
 namespace System
 {
     // This is a hack to enable our span code to work inside MSBuild task without referencing System.Memory