diff --git a/google-cloud-clients/google-cloud-contrib/google-cloud-nio/src/main/java/com/google/cloud/storage/contrib/nio/CloudStorageFileSystemProvider.java b/google-cloud-clients/google-cloud-contrib/google-cloud-nio/src/main/java/com/google/cloud/storage/contrib/nio/CloudStorageFileSystemProvider.java
index 021f4e468fec..d4d7e0a246ee 100644
--- a/google-cloud-clients/google-cloud-contrib/google-cloud-nio/src/main/java/com/google/cloud/storage/contrib/nio/CloudStorageFileSystemProvider.java
+++ b/google-cloud-clients/google-cloud-contrib/google-cloud-nio/src/main/java/com/google/cloud/storage/contrib/nio/CloudStorageFileSystemProvider.java
@@ -907,11 +907,11 @@ public boolean requesterPays(String bucketName) {
       // instead of true/false, this method returns true/null.
       Boolean isRP = storage.get(bucketName).requesterPays();
       return isRP != null && isRP.booleanValue();
-    } catch (StorageException sex) {
-      if (sex.getCode() == 400 && sex.getMessage().contains("Bucket is requester pays")) {
+    } catch (StorageException ex) {
+      if (ex.getCode() == 400 && ex.getMessage().contains("Bucket is requester pays")) {
         return true;
       }
-      throw sex;
+      throw ex;
     }
   }
 
diff --git a/google-cloud-clients/google-cloud-contrib/google-cloud-nio/src/test/java/com/google/cloud/storage/contrib/nio/it/ITGcsNio.java b/google-cloud-clients/google-cloud-contrib/google-cloud-nio/src/test/java/com/google/cloud/storage/contrib/nio/it/ITGcsNio.java
index 28f7dc6f2c5b..b99b914d4435 100644
--- a/google-cloud-clients/google-cloud-contrib/google-cloud-nio/src/test/java/com/google/cloud/storage/contrib/nio/it/ITGcsNio.java
+++ b/google-cloud-clients/google-cloud-contrib/google-cloud-nio/src/test/java/com/google/cloud/storage/contrib/nio/it/ITGcsNio.java
@@ -166,8 +166,8 @@ public void testFileExistsRequesterPaysNoUserProject() throws IOException {
       // fails because we must pay for every access, including metadata.
       Files.exists(path);
       Assert.fail("It should have thrown an exception.");
-    } catch (StorageException sex) {
-      assertIsRequesterPaysException("testFileExistsRequesterPaysNoUserProject", sex);
+    } catch (StorageException ex) {
+      assertIsRequesterPaysException("testFileExistsRequesterPaysNoUserProject", ex);
     }
   }
 
@@ -196,8 +196,8 @@ public void testCantCreateWithoutUserProject() throws IOException {
       // fails
       Files.write(path, "I would like to write".getBytes());
       Assert.fail("It should have thrown an exception.");
-    } catch (StorageException sex) {
-      assertIsRequesterPaysException("testCantCreateWithoutUserProject", sex);
+    } catch (StorageException ex) {
+      assertIsRequesterPaysException("testCantCreateWithoutUserProject", ex);
     }
   }
 
@@ -218,8 +218,8 @@ public void testCantReadWithoutUserProject() throws IOException {
       // fails
       Files.readAllBytes(path);
       Assert.fail("It should have thrown an exception.");
-    } catch (StorageException sex) {
-      assertIsRequesterPaysException("testCantReadWithoutUserProject", sex);
+    } catch (StorageException ex) {
+      assertIsRequesterPaysException("testCantReadWithoutUserProject", ex);
     }
   }
 
@@ -269,8 +269,8 @@ private void innerTestCantCopyWithoutUserProject(
           description,
           hex.getMessage()
               .contains("Bucket is requester pays bucket but no user project provided"));
-    } catch (StorageException sex) {
-      assertIsRequesterPaysException(description, sex);
+    } catch (StorageException ex) {
+      assertIsRequesterPaysException(description, ex);
     }
   }
 
@@ -317,11 +317,11 @@ public void testAutodetectWhenNotRequesterPays() throws IOException {
         "");
   }
 
-  private void assertIsRequesterPaysException(String message, StorageException sex) {
-    Assert.assertEquals(message, sex.getCode(), 400);
+  private void assertIsRequesterPaysException(String message, StorageException ex) {
+    Assert.assertEquals(message, ex.getCode(), 400);
     Assert.assertTrue(
         message,
-        sex.getMessage().contains("Bucket is requester pays bucket but no user project provided"));
+        ex.getMessage().contains("Bucket is requester pays bucket but no user project provided"));
   }
 
   // End of tests related to the "requester pays" feature