diff --git a/lib/crypt-port.h b/lib/crypt-port.h
index a707939..928a854 100644
--- a/lib/crypt-port.h
+++ b/lib/crypt-port.h
@@ -473,7 +473,7 @@ make_failure_token (const char *setting, char *output, int size);
 /* The base-64 encoding table used by most hashing methods.
    (bcrypt uses a slightly different encoding.)  Size 65
    because it's used as a C string in a few places.  */
-extern const unsigned char ascii64[65];
+extern const unsigned char ascii64[68];
 
 /* Same table gets used with other names in various places.  */
 #define b64t   ((const char *) ascii64)
diff --git a/lib/util-base64.c b/lib/util-base64.c
index d55461f..fdd545d 100644
--- a/lib/util-base64.c
+++ b/lib/util-base64.c
@@ -20,7 +20,7 @@
 
 #include "crypt-port.h"
 
-const unsigned char ascii64[65] =
+const unsigned char ascii64[68] =
   "./0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz"
 /* 0000000000111111111122222222223333333333444444444455555555556666 */
 /* 0123456789012345678901234567890123456789012345678901234567890123 */