diff --git a/Mac/BuildScript/build-installer.py b/Mac/BuildScript/build-installer.py
index 68868d9..d2b04d1 100755
--- a/Mac/BuildScript/build-installer.py
+++ b/Mac/BuildScript/build-installer.py
@@ -1524,6 +1524,10 @@
             shellQuote(os.path.join(WORKDIR, 'installer')),
             shellQuote(imagepath + ".tmp.dmg" )))
 
+    # Try to mitigate race condition in certain versions of macOS, e.g. 10.9,
+    # when hdiutil fails with  "Resource busy"
+
+    time.sleep(10)
 
     if not os.path.exists(os.path.join(WORKDIR, "mnt")):
         os.mkdir(os.path.join(WORKDIR, "mnt"))