diff --git a/var/spack/repos/builtin/packages/oce/package.py b/var/spack/repos/builtin/packages/oce/package.py
index 15bc9ab39e7..c968eb1973a 100644
--- a/var/spack/repos/builtin/packages/oce/package.py
+++ b/var/spack/repos/builtin/packages/oce/package.py
@@ -92,7 +92,8 @@ def install(self, spec, prefix):
                 '-DOCE_OSX_USE_COCOA:BOOL=ON',
             ])
 
-        if macOS_version() >= Version('10.12'):
+        if platform.system() == 'Darwin' and (
+           macOS_version() >= Version('10.12')):
             # use @rpath on Sierra due to limit of dynamic loader
             options.append('-DCMAKE_MACOSX_RPATH=ON')
         else:
diff --git a/var/spack/repos/builtin/packages/trilinos/package.py b/var/spack/repos/builtin/packages/trilinos/package.py
index 784253158fa..4262054690b 100644
--- a/var/spack/repos/builtin/packages/trilinos/package.py
+++ b/var/spack/repos/builtin/packages/trilinos/package.py
@@ -586,7 +586,7 @@ def cmake_args(self):
                 '-DTrilinos_ENABLE_FEI=OFF'
             ])
 
-        if macOS_version() >= Version('10.12'):
+        if sys.platform == 'darwin' and macOS_version() >= Version('10.12'):
             # use @rpath on Sierra due to limit of dynamic loader
             options.append('-DCMAKE_MACOSX_RPATH=ON')
         else: