diff --git a/unix/sockcmsg_unix.go b/unix/sockcmsg_unix.go
index 26e8b36c..723b7f10 100644
--- a/unix/sockcmsg_unix.go
+++ b/unix/sockcmsg_unix.go
@@ -18,6 +18,9 @@ func cmsgAlignOf(salen int) int {
 	salign := SizeofPtr
 
 	switch runtime.GOOS {
+	case "aix":
+		// There is no alignment on AIX.
+		salign = 1
 	case "darwin", "dragonfly", "solaris":
 		// NOTE: It seems like 64-bit Darwin, DragonFly BSD and
 		// Solaris kernels still require 32-bit aligned access to