diff --git a/appveyor.yml b/appveyor.yml
index cbcbec2b..3867c85f 100644
--- a/appveyor.yml
+++ b/appveyor.yml
@@ -9,6 +9,7 @@ environment:
     DISTUTILS_USE_SDK: "1"
 
 install:
+   - cinst nmap
    - "%PYTHON%\\python.exe -m pip install -r dev-requirements.txt"
    - "%PYTHON%\\python.exe -m pip install -r win-requirements.txt"