diff --git a/src/test/mir-opt/const_prop/large_array_index/32bit/rustc.main.ConstProp.diff b/src/test/mir-opt/const_prop/large_array_index.main.ConstProp.diff.32bit
similarity index 100%
rename from src/test/mir-opt/const_prop/large_array_index/32bit/rustc.main.ConstProp.diff
rename to src/test/mir-opt/const_prop/large_array_index.main.ConstProp.diff.32bit
diff --git a/src/test/mir-opt/const_prop/large_array_index/64bit/rustc.main.ConstProp.diff b/src/test/mir-opt/const_prop/large_array_index.main.ConstProp.diff.64bit
similarity index 100%
rename from src/test/mir-opt/const_prop/large_array_index/64bit/rustc.main.ConstProp.diff
rename to src/test/mir-opt/const_prop/large_array_index.main.ConstProp.diff.64bit
diff --git a/src/test/mir-opt/const_prop/large_array_index.rs b/src/test/mir-opt/const_prop/large_array_index.rs
index e6a12f3364aea..48d134376db62 100644
--- a/src/test/mir-opt/const_prop/large_array_index.rs
+++ b/src/test/mir-opt/const_prop/large_array_index.rs
@@ -1,6 +1,6 @@
 // EMIT_MIR_FOR_EACH_BIT_WIDTH
 
-// EMIT_MIR rustc.main.ConstProp.diff
+// EMIT_MIR large_array_index.main.ConstProp.diff
 fn main() {
     // check that we don't propagate this, because it's too large
     let x: u8 = [0_u8; 5000][2];