diff --git a/src/IKVM.Tools.Importer/CompilerClassLoader.cs b/src/IKVM.Tools.Importer/CompilerClassLoader.cs
index 0e7b4b3ca..beed16fed 100644
--- a/src/IKVM.Tools.Importer/CompilerClassLoader.cs
+++ b/src/IKVM.Tools.Importer/CompilerClassLoader.cs
@@ -291,7 +291,7 @@ private RuntimeJavaType GetTypeWrapperCompilerHook(string name)
                     {
                         f = new ClassFile(Context, ClassReader.Read(itemRef.GetData()), name, ClassFileParseOptions, null);
                     }
-                    catch (Exception x) where (x is ClassFormatError or ByteCodeException)
+                    catch (Exception x) when (x is ByteCodeException or ClassFormatError)
                     {
                         Context.StaticCompiler.SuppressWarning(options, Message.ClassNotFound, name);
                         Context.StaticCompiler.IssueMessage(options, Message.ClassFormatError, name, x.Message);