diff --git a/src/Lean/Server/Completion/CompletionUtils.lean b/src/Lean/Server/Completion/CompletionUtils.lean
index 1ee43b47cb..0001c47bf4 100644
--- a/src/Lean/Server/Completion/CompletionUtils.lean
+++ b/src/Lean/Server/Completion/CompletionUtils.lean
@@ -22,7 +22,7 @@ where
       let ac := aPos.get' a ha
       let bc := bPos.get' b hb
       let bPos := bPos.next' b hb
-      if ac == bc then
+      if ac.toLower == bc.toLower then
         let aPos := aPos.next' a ha
         go aPos bPos
       else
diff --git a/tests/lean/interactive/completionOption.lean.expected.out b/tests/lean/interactive/completionOption.lean.expected.out
index 1b7463f9ed..3e9c34d1d7 100644
--- a/tests/lean/interactive/completionOption.lean.expected.out
+++ b/tests/lean/interactive/completionOption.lean.expected.out
@@ -273,6 +273,19 @@ Resolution of format.indent:
    "detail":
    "(false), enable/disable tracing for the given module and submodules",
    "data": ["«external:file:///completionOption.lean»", 7, 23, 0]},
+  {"textEdit":
+   {"replace":
+    {"start": {"line": 7, "character": 11},
+     "end": {"line": 7, "character": 23}},
+    "newText": "trace.PrettyPrinter.parenthesize.backtrack",
+    "insert":
+    {"start": {"line": 7, "character": 11},
+     "end": {"line": 7, "character": 23}}},
+   "label": "trace.PrettyPrinter.parenthesize.backtrack",
+   "kind": 10,
+   "detail":
+   "(false), enable/disable tracing for the given module and submodules",
+   "data": ["«external:file:///completionOption.lean»", 7, 23, 0]},
   {"textEdit":
    {"replace":
     {"start": {"line": 7, "character": 11},
@@ -337,6 +350,18 @@ Resolution of trace.pp.analyze.error:
  "detail":
  "(false), enable/disable tracing for the given module and submodules",
  "data": ["«external:file:///completionOption.lean»", 7, 23, 0]}
+Resolution of trace.PrettyPrinter.parenthesize.backtrack:
+{"textEdit":
+ {"replace":
+  {"start": {"line": 7, "character": 11}, "end": {"line": 7, "character": 23}},
+  "newText": "trace.PrettyPrinter.parenthesize.backtrack",
+  "insert":
+  {"start": {"line": 7, "character": 11}, "end": {"line": 7, "character": 23}}},
+ "label": "trace.PrettyPrinter.parenthesize.backtrack",
+ "kind": 10,
+ "detail":
+ "(false), enable/disable tracing for the given module and submodules",
+ "data": ["«external:file:///completionOption.lean»", 7, 23, 0]}
 Resolution of trace.pp.analyze:
 {"textEdit":
  {"replace":