diff --git a/lib/util/getGitRootDir.js b/lib/util/getGitRootDir.js
index 1003132f..8fdbceb2 100644
--- a/lib/util/getGitRootDir.js
+++ b/lib/util/getGitRootDir.js
@@ -1,7 +1,8 @@
 const {execSync} = require('child_process');
 
 const getGitRootDir = () => {
-  const dir = execSync('git rev-parse --show-toplevel 2>/dev/null')
+  const devNull = os.platform() === 'win32' ? 'nul' : '/dev/null'
+  const dir = execSync('git rev-parse --show-toplevel 2> ' + devNull)
     .toString()
     .trim();
 
diff --git a/lib/util/lerna.js b/lib/util/lerna.js
index 6ef0b22b..26500102 100755
--- a/lib/util/lerna.js
+++ b/lib/util/lerna.js
@@ -27,11 +27,13 @@ const getAllPackages = (state) => {
   }
 };
 
-const getChangedFiles = () =>
-  execSync('git diff --cached --name-only 2>/dev/null')
+const getChangedFiles = () => {
+  const devNull = os.platform() === 'win32' ? 'nul' : '/dev/null'
+  execSync('git diff --cached --name-only 2> ' + devNull)
     .toString()
     .trim()
     .split('\n');
+}
 
 const getChangedPackages = () => {
   const unique = {};