diff --git a/src/misc/pkcs5/pkcs_5_test.c b/src/misc/pkcs5/pkcs_5_test.c
index 61f8f38..fc33c73 100644
--- a/src/misc/pkcs5/pkcs_5_test.c
+++ b/src/misc/pkcs5/pkcs_5_test.c
@@ -154,7 +154,7 @@ int pkcs_5_test (void)
         }
     };
 
-    unsigned char DK[25];
+    unsigned char DK[40];
     unsigned long dkLen;
     int i, err;
     int tested=0, failed=0;