diff --git a/src/engine/jam.h b/src/engine/jam.h
index 660c58faf..73a7a04c5 100644
--- a/src/engine/jam.h
+++ b/src/engine/jam.h
@@ -453,6 +453,7 @@
 
 #if defined( _i386_   ) || \
     defined( __i386__ ) || \
+    defined( __i386   ) || \
     defined( _M_IX86  )
     #define OSPLAT "OSPLAT=X86"
 #endif
@@ -470,7 +471,8 @@
 #endif
 
 
-#ifdef __sparc__
+#if defined( __sparc__ ) || \
+    defined( __sparc   )
     #define OSPLAT "OSPLAT=SPARC"
 #endif