diff --git a/source/dub/logging.d b/source/dub/logging.d
index a9b147f..daa7a4f 100644
--- a/source/dub/logging.d
+++ b/source/dub/logging.d
@@ -122,8 +122,8 @@
   {
     version (CRuntime_DigitalMars)
     {
-      if (!isatty(core.stdc.stdio.stdout) ||
-          !isatty(core.stdc.stdio.stderr))
+      if (!isatty(core.stdc.stdio.stdout._file) ||
+          !isatty(core.stdc.stdio.stderr._file))
         _printColors = false;
     }
     else version (CRuntime_Microsoft)