diff --git a/opcodes/.gitattributes b/opcodes/.gitattributes
new file mode 100644
index 00000000000..f3d477b6390
--- /dev/null
+++ b/opcodes/.gitattributes
@@ -0,0 +1,3 @@
+# The aarch64 generated files use spaces for indentation, so we need to
+# overrule the top-level whitespace rule.
+aarch64*-2.*	whitespace=space-before-tab,trailing-space