diff --git a/pmd-core/src/main/java/net/sourceforge/pmd/PMDConfiguration.java b/pmd-core/src/main/java/net/sourceforge/pmd/PMDConfiguration.java
index 9e582392f4..9d3c67aead 100644
--- a/pmd-core/src/main/java/net/sourceforge/pmd/PMDConfiguration.java
+++ b/pmd-core/src/main/java/net/sourceforge/pmd/PMDConfiguration.java
@@ -391,7 +391,7 @@ public class PMDConfiguration extends AbstractConfiguration {
     @Deprecated
     public void setRuleSets(String ruleSets) {
         if (ruleSets == null) {
-            this.ruleSets= new ArrayList<>();
+            this.ruleSets = new ArrayList<>();
         } else {
             this.ruleSets = new ArrayList<>(Arrays.asList(ruleSets.split(",")));
         }