indents.diff

diff --git a/jmh-core/src/main/java/org/openjdk/jmh/generators/core/BenchmarkGenerator.java b/jmh-core/src/main/java/org/openjdk/jmh/generators/core/BenchmarkGenerator.java
--- a/jmh-core/src/main/java/org/openjdk/jmh/generators/core/BenchmarkGenerator.java
+++ b/jmh-core/src/main/java/org/openjdk/jmh/generators/core/BenchmarkGenerator.java
@@ -1115,19 +1115,21 @@
         }
     }
 
-    static String[] INDENTS = new String[0];
+    static volatile String[] INDENTS = new String[0];
 
     static String ident(int tabs) {
         final int TAB_SIZE = 4;
-        if (tabs >= INDENTS.length) {
-            INDENTS = new String[tabs + 1];
+        String[] indents = INDENTS;
+        if (tabs >= indents.length) {
+            indents = new String[tabs + 1];
             for (int p = 0; p <= tabs; p++) {
                 char[] chars = new char[p * TAB_SIZE];
                 Arrays.fill(chars, ' ');
-                INDENTS[p] = new String(chars);
+                indents[p] = new String(chars);
             }
+            INDENTS = indents;
         }
-        return INDENTS[tabs];
+        return indents[tabs];
     }
 
 }