diff --git a/auto/configure b/auto/configure
index 474d69e84..5b88ebb4c 100755
--- a/auto/configure
+++ b/auto/configure
@@ -44,6 +44,7 @@ if test -z "$NGX_PLATFORM"; then
 else
     echo "building for $NGX_PLATFORM"
     NGX_SYSTEM=$NGX_PLATFORM
+    NGX_MACHINE=i386
 fi
 
 . auto/cc/conf