diff --git a/startup.4th b/startup.4th
index 3e791c6..75219a5 100644
--- a/startup.4th
+++ b/startup.4th
@@ -1365,7 +1365,6 @@ DEFER REFILL
 ' UTILITY (DEFINITIONS)
 
 \ Extra field type descriptors for FFI structs
-\ Each type is naturally aligned (contrast int64% vs 2CELL%)
 \ The signed/unsigned variants are just for documentation
 1 DUP 2CONSTANT int8%    LATEST
    ▪  DUP ALIAS uint8%
@@ -1382,7 +1381,8 @@ DEFER REFILL
    ▪  DUP ALIAS unsigned-int%
    ▪  DUP ALIAS signed-long%
    ▪      ALIAS unsigned-long%
-8 DUP 2CONSTANT int64%   LATEST
+\ Maximum alignment is four bytes, even for 64-bit integer types
+4  8  2CONSTANT int64%   LATEST
    ▪  DUP ALIAS uint64%
    ▪  DUP ALIAS signed-long-long%
    ▪      ALIAS unsigned-long-long%