diff --git a/src/os/unix/ngx_user.c b/src/os/unix/ngx_user.c
index 4bad1c3..165c6a4 100644
--- a/src/os/unix/ngx_user.c
+++ b/src/os/unix/ngx_user.c
@@ -41,11 +41,11 @@
     err = ngx_errno;
 
     if (err == 0) {
-        len = ngx_strlen(value);
+        len = ngx_strlen(value) + 1;
 
         *encrypted = ngx_pnalloc(pool, len);
         if (*encrypted) {
-            ngx_memcpy(*encrypted, value, len + 1);
+            ngx_memcpy(*encrypted, value, len);
             return NGX_OK;
         }
     }
@@ -79,11 +79,11 @@
     value = crypt((char *) key, (char *) salt);
 
     if (value) {
-        len = ngx_strlen(value);
+        len = ngx_strlen(value) + 1;
 
         *encrypted = ngx_pnalloc(pool, len);
         if (*encrypted) {
-            ngx_memcpy(*encrypted, value, len + 1);
+            ngx_memcpy(*encrypted, value, len);
         }
 
 #if (NGX_THREADS && NGX_NONREENTRANT_CRYPT)