diff --git a/src/main/java/org/passay/PasswordGenerator.java b/src/main/java/org/passay/PasswordGenerator.java
index f4d5d35..6b4f6b3 100644
--- a/src/main/java/org/passay/PasswordGenerator.java
+++ b/src/main/java/org/passay/PasswordGenerator.java
@@ -120,7 +120,9 @@ public String generatePassword(final int length, final List<? extends Rule> rule
                     characterRule.getValidCharacters(),
                     Math.min(length, characterRule.getNumberOfCharacters()),
                     buffer);
-            allChars.append(characterRule.getValidCharacters());
+            if (count == 0) {
+              allChars.append(characterRule.getValidCharacters());
+            }
           }
         }
       }