diff --git a/src/share/classes/sun/security/krb5/internal/ccache/CCacheInputStream.java b/src/share/classes/sun/security/krb5/internal/ccache/CCacheInputStream.java
index 9271d9bcefbca3aba339b660da4cede120aa11d5..64c3f8cd85bae7029baa796ea58a3d1462a1db86 100644
--- a/src/share/classes/sun/security/krb5/internal/ccache/CCacheInputStream.java
+++ b/src/share/classes/sun/security/krb5/internal/ccache/CCacheInputStream.java
@@ -215,7 +215,9 @@ public class CCacheInputStream extends KrbDataInputStream implements FileCCacheC
                 addrType = read(2);
                 addrLength = read(4);
                 if (!(addrLength == 4 || addrLength == 16)) {
-                    System.out.println("Incorrect address format.");
+                    if (DEBUG) {
+                        System.out.println("Incorrect address format.");
+                    }
                     return null;
                 }
                 byte[] result = new byte[addrLength];
diff --git a/src/share/classes/sun/security/krb5/internal/crypto/dk/AesDkCrypto.java b/src/share/classes/sun/security/krb5/internal/crypto/dk/AesDkCrypto.java
index 31919fc51f5b6e83d2181fd41b942ba6ce95b169..ea6e2d3eb241722543106fc7c155eecd0922b07d 100644
--- a/src/share/classes/sun/security/krb5/internal/crypto/dk/AesDkCrypto.java
+++ b/src/share/classes/sun/security/krb5/internal/crypto/dk/AesDkCrypto.java
@@ -440,7 +440,9 @@ public class AesDkCrypto extends DkCrypto {
                 for (int i = 0; i < hashSize; i++) {
                     if (calculatedHmac[i] != ciphertext[hmacOffset+i]) {
                         cksumFailed = true;
-                        System.err.println("Checksum failed !");
+                        if (debug) {
+                            System.err.println("Checksum failed !");
+                        }
                         break;
                     }
                 }
diff --git a/src/share/classes/sun/security/krb5/internal/crypto/dk/ArcFourCrypto.java b/src/share/classes/sun/security/krb5/internal/crypto/dk/ArcFourCrypto.java
index 57a0c091721199eb5718eeb0fc8050442b2eed2c..8d4c89d60b3e956c6cf7a6bd08a18743c863ae54 100644
--- a/src/share/classes/sun/security/krb5/internal/crypto/dk/ArcFourCrypto.java
+++ b/src/share/classes/sun/security/krb5/internal/crypto/dk/ArcFourCrypto.java
@@ -397,7 +397,9 @@ public class ArcFourCrypto extends DkCrypto {
             for (int i = 0; i < hashSize; i++) {
                 if (calculatedHmac[i] != ciphertext[i]) {
                     cksumFailed = true;
-                    System.err.println("Checksum failed !");
+                    if (debug) {
+                        System.err.println("Checksum failed !");
+                    }
                     break;
                 }
             }