diff --git a/tools/tdbg/commands.go b/tools/tdbg/commands.go
index 5225f3f977b..cd01dc6ef9c 100644
--- a/tools/tdbg/commands.go
+++ b/tools/tdbg/commands.go
@@ -394,9 +394,8 @@ func AdminGetShardID(c *cli.Context) error {
 
 // getCategory first searches the registry for the category by the [tasks.Category.Name].
 func getCategory(registry tasks.TaskCategoryRegistry, key string) (tasks.Category, error) {
-	key = strings.ToLower(key)
 	for _, category := range registry.GetCategories() {
-		if category.Name() == key {
+		if strings.EqualFold(category.Name(), key) {
 			return category, nil
 		}
 	}
diff --git a/tools/tdbg/commands_test.go b/tools/tdbg/commands_test.go
new file mode 100644
index 00000000000..55fd4eaf576
--- /dev/null
+++ b/tools/tdbg/commands_test.go
@@ -0,0 +1,73 @@
+// The MIT License
+//
+// Copyright (c) 2024 Temporal Technologies Inc.  All rights reserved.
+//
+// Permission is hereby granted, free of charge, to any person obtaining a copy
+// of this software and associated documentation files (the "Software"), to deal
+// in the Software without restriction, including without limitation the rights
+// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+// copies of the Software, and to permit persons to whom the Software is
+// furnished to do so, subject to the following conditions:
+//
+// The above copyright notice and this permission notice shall be included in
+// all copies or substantial portions of the Software.
+//
+// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+// THE SOFTWARE.
+
+package tdbg
+
+import (
+	"testing"
+
+	"github.com/stretchr/testify/require"
+	"go.temporal.io/server/service/history/tasks"
+)
+
+func TestGetCategory(t *testing.T) {
+	cat101 := tasks.NewCategory(101, tasks.CategoryTypeImmediate, "CategoryName")
+
+	registry := tasks.NewDefaultTaskCategoryRegistry()
+	registry.AddCategory(cat101)
+
+	testCases := []struct {
+		name        string
+		input       string
+		expectedCat tasks.Category
+		expectedErr string
+	}{
+		{
+			name:        "same case",
+			input:       "CategoryName",
+			expectedCat: cat101,
+		},
+		{
+			name:        "different case",
+			input:       "cAtEgOrYnAmE",
+			expectedCat: cat101,
+		},
+		{
+			name:        "not found",
+			input:       "random",
+			expectedErr: "unknown task category \"random\"",
+		},
+	}
+
+	for _, tc := range testCases {
+		t.Run(tc.name, func(t *testing.T) {
+			s := require.New(t)
+			cat, err := getCategory(registry, tc.input)
+			if tc.expectedErr == "" {
+				s.NoError(err)
+				s.Equal(tc.expectedCat, cat)
+			} else {
+				s.ErrorContains(err, tc.expectedErr)
+			}
+		})
+	}
+}