diff --git a/src/build/config-cache.jam b/src/build/config-cache.jam
index ff05fb6f8..5297dbb84 100644
--- a/src/build/config-cache.jam
+++ b/src/build/config-cache.jam
@@ -23,7 +23,8 @@ rule save ( )
 {
     if $(.cache-file)
     {
-        local target = <new-cache-file>$(.cache-file) ;
+        local cache-file-native = [ path.native $(.cache-file) ] ;
+        local target = <new-cache-file>$(cache-file-native) ;
         local contents = "# Automatically generated by Boost.Build.\n# Do not edit.\n\nmodule config-cache {\n" ;
         for local var in $(.all-vars)
         {
@@ -54,7 +55,7 @@ rule load ( cache-file )
     {
         errors.error duplicate load of cache file ;
     }
-    cache-file = $(cache-file) ;
+    cache-file = [ path.native $(cache-file) ] ;
     if [ path.exists $(cache-file) ] && ! ( --reconfigure in [ modules.peek : ARGV ] )
     {
         include <old-cache-file>$(cache-file) ;