diff --git a/src/tools/darwin.jam b/src/tools/darwin.jam
index 9569f73b3..37bfbf88c 100644
--- a/src/tools/darwin.jam
+++ b/src/tools/darwin.jam
@@ -232,10 +232,6 @@ local rule init-available-sdk-versions ( condition * : root ? )
         local sdk-match = [ MATCH ([^0-9]+)([0-9]+)[.]([0-9x]+)[.]?([0-9x]+)? : $(sdk:D=) ] ;
         local sdk-platform = $(sdk-match[1]:L) ;
         local sdk-version = $(sdk-match[2]).$(sdk-match[3]) ;
-        if $(sdk-match[4])
-        {
-            sdk-version = $(sdk-version).$(sdk-match[4]) ;
-        }
         if $(sdk-version)
         {
             switch $(sdk-platform)
@@ -246,10 +242,18 @@ local rule init-available-sdk-versions ( condition * : root ? )
                 }
                 case iphoneos :
                 {
+                    if $(sdk-match[4])
+                    {
+                        sdk-version = $(sdk-version).$(sdk-match[4]) ;
+                    }
                     sdk-version = iphone-$(sdk-version) ;
                 }
                 case iphonesimulator :
                 {
+                    if $(sdk-match[4])
+                    {
+                        sdk-version = $(sdk-version).$(sdk-match[4]) ;
+                    }
                     sdk-version = iphonesim-$(sdk-version) ;
                 }
                 case * :