diff --git a/lib/output.js b/lib/output.js
index 670d20e8c..450318786 100644
--- a/lib/output.js
+++ b/lib/output.js
@@ -255,7 +255,7 @@ function OutputStream(options) {
     if (options.shorthand === undefined)
         options.shorthand = options.ecma > 5;
 
-    // Convert comment option to RegExp if neccessary and set up comments filter
+    // Convert comment option to RegExp if necessary and set up comments filter
     var comment_filter = return_false; // Default case, throw all comments away
     if (options.comments) {
         let comments = options.comments;
diff --git a/test/compress/issue-143.js b/test/compress/issue-143.js
index 453a99291..2b4e12730 100644
--- a/test/compress/issue-143.js
+++ b/test/compress/issue-143.js
@@ -12,7 +12,7 @@
  * a >= (a = parseInt('100')) → 99 >= 100 → false
  */
 
-tranformation_sort_order_equal: {
+transformation_sort_order_equal: {
     options = {
         comparisons: true,
     }
@@ -21,7 +21,7 @@ tranformation_sort_order_equal: {
     expect: { (a = parseInt('100')) == a }
 }
 
-tranformation_sort_order_unequal: {
+transformation_sort_order_unequal: {
     options = {
         comparisons: true,
     }
@@ -30,7 +30,7 @@ tranformation_sort_order_unequal: {
     expect: { (a = parseInt('100')) != a }
 }
 
-tranformation_sort_order_lesser_or_equal: {
+transformation_sort_order_lesser_or_equal: {
     options = {
         comparisons: true,
     }
@@ -38,11 +38,11 @@ tranformation_sort_order_lesser_or_equal: {
     input: { (a = parseInt('100')) <= a }
     expect: { (a = parseInt('100')) <= a }
 }
-tranformation_sort_order_greater_or_equal: {
+transformation_sort_order_greater_or_equal: {
     options = {
         comparisons: true,
     }
 
     input: { (a = parseInt('100')) >= a }
     expect: { (a = parseInt('100')) >= a }
-}
\ No newline at end of file
+}