diff --git a/aclocal.m4 b/aclocal.m4
index 64fa8bf708b7c5f4e472a856d97ab2bf0601200a..c8c59859b24e5f2c215171f219f8fa45e5721ec4 100644
--- a/aclocal.m4
+++ b/aclocal.m4
@@ -229,7 +229,7 @@ AC_DEFUN([FPTOOLS_SET_HASKELL_PLATFORM_VARS],
 
     checkVendor() {
         case [$]1 in
-        dec|none|unknown|hp|apple|next|sun|sgi|ibm|montavista|portbld)
+        dec|none|unknown|hp|apple|next|sun|sgi|ibm|montavista|portbld|alpine)
             ;;
         *)
             AC_MSG_WARN([Unknown vendor [$]1])