diff --git a/CHANGELOG.md b/CHANGELOG.md
index 2cf20cfba..e668f740d 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,3 +1,7 @@
+## 1.32.13
+
+* Use the proper parameter names in error messages about `string.slice`
+
 ## 1.32.12
 
 * Fix a bug that disallowed more than one module from extending the same
diff --git a/lib/src/functions/string.dart b/lib/src/functions/string.dart
index 076a1b662..ba33bc402 100644
--- a/lib/src/functions/string.dart
+++ b/lib/src/functions/string.dart
@@ -93,8 +93,8 @@ final _slice =
   var string = arguments[0].assertString("string");
   var start = arguments[1].assertNumber("start-at");
   var end = arguments[2].assertNumber("end-at");
-  start.assertNoUnits("start");
-  end.assertNoUnits("end");
+  start.assertNoUnits("start-at");
+  end.assertNoUnits("end-at");
 
   var lengthInCodepoints = string.sassLength;
 
diff --git a/pubspec.yaml b/pubspec.yaml
index 0d336a6a7..9195721c2 100644
--- a/pubspec.yaml
+++ b/pubspec.yaml
@@ -1,5 +1,5 @@
 name: sass
-version: 1.32.12
+version: 1.32.13-dev
 description: A Sass implementation in Dart.
 author: Sass Team
 homepage: https://github.com/sass/dart-sass