diff --git a/var/spack/repos/builtin/packages/apple-gl/package.py b/var/spack/repos/builtin/packages/apple-gl/package.py
index b9ff9dd37b4..ac3cd2d8ee4 100644
--- a/var/spack/repos/builtin/packages/apple-gl/package.py
+++ b/var/spack/repos/builtin/packages/apple-gl/package.py
@@ -23,8 +23,10 @@ class AppleGl(Package):
     # Only supported on 'platform=darwin' and compiler=apple-clang
     conflicts("platform=linux")
     conflicts("platform=cray")
+    conflicts("platform=windows")
     conflicts("%gcc")
     conflicts("%clang")
+    conflicts("%msvc")
 
     phases = []