diff --git a/Libraries/LibC/grp.cpp b/Libraries/LibC/grp.cpp
index 6d66e76268..f04e5d0545 100644
--- a/Libraries/LibC/grp.cpp
+++ b/Libraries/LibC/grp.cpp
@@ -140,8 +140,8 @@ next_entry:
     }
     __grdb_entry->members[members.size()] = nullptr;
     __grdb_entry->gr_mem = __grdb_entry->members;
-    strncpy(__grdb_entry->name_buffer, e_name.characters(), GRDB_STR_MAX_LEN);
-    strncpy(__grdb_entry->passwd_buffer, e_passwd.characters(), GRDB_STR_MAX_LEN);
+    strncpy(__grdb_entry->name_buffer, e_name.characters(), GRDB_STR_MAX_LEN - 1);
+    strncpy(__grdb_entry->passwd_buffer, e_passwd.characters(), GRDB_STR_MAX_LEN - 1);
     return __grdb_entry;
 }