diff --git a/docs/conf.py b/docs/conf.py
index 08c4e113b..52bb50a8d 100644
--- a/docs/conf.py
+++ b/docs/conf.py
@@ -40,8 +40,10 @@ os.environ["PATH"] += os.pathsep + os.path.abspath(binpath + 'Development/')
 os.environ["PATH"] += os.pathsep + os.path.abspath(binpath + 'Release/')
 
 if sys.platform == 'win32' and sys.version_info[1] >= 8:
-    os.add_dll_directory(binpath + 'Release/')
-    os.add_dll_directory(binpath + 'Development/')
+    for sub in ['Release', 'Development']:
+        path = os.path.abspath(binpath + sub)
+        if os.path.exists(path):
+            os.add_dll_directory(path)
 
 # path to module libraries for linux
 sys.path.insert(0, os.path.abspath('../build/lib'))