diff --git a/libdex/CmdUtils.cpp b/libdex/CmdUtils.cpp
index cdb7bb9..8244a11 100644
--- a/libdex/CmdUtils.cpp
+++ b/libdex/CmdUtils.cpp
@@ -54,7 +54,7 @@
         goto bail;
     }
 
-    fd = open(outFileName, O_RDWR | O_CREAT | O_EXCL, 0600);
+    fd = open(outFileName, O_RDWR | O_CREAT | O_EXCL | O_BINARY, 0600);
     if (fd < 0) {
         fprintf(stderr, "Unable to create output file '%s': %s\n",
             outFileName, strerror(errno));