diff --git a/test/DebugInfo/AArch64/coalescing.ll b/test/DebugInfo/AArch64/coalescing.ll
index 15f9957fcda..4e2e5355bbf 100644
--- a/test/DebugInfo/AArch64/coalescing.ll
+++ b/test/DebugInfo/AArch64/coalescing.ll
@@ -5,7 +5,7 @@
 ; void start() {
 ;   unsigned size;
 ;   foo(&size);
-;   if (size != 0) {
+;   if (size != 0) { // Work around a bug to preserve the dbg.value.
 ;   }
 ; }