diff --git a/bin/sf-clean.js b/bin/sf-clean.js
index 9d8e66d..657c525 100755
--- a/bin/sf-clean.js
+++ b/bin/sf-clean.js
@@ -24,11 +24,21 @@ const gitignorePath = loadRootPath('.gitignore');
 if (gitignorePath) {
   const VALID_SEGMENTS = ['CLEAN', 'CLEAN ALL'];
   const gitignore = readFileSync(join(gitignorePath, '.gitignore'), 'utf8');
+
+  // respect the file EOL (`CRLF` or `LF`).
+  //
+  // we can't use node's `os.EOL` because that assumes:
+  //   * unix only uses `CL`
+  //   * win only uses `CRLF`
+  //
+  // when all 4 scenarios are completely valid
+  const originalEOL = gitignore.includes('\r\n') ? '\r\n' : '\n';
+
   const segments = gitignore
     // Segments are defined by "# --" in the gitignore
     .split('# --')
     // Turn each segment into list of valid gitignore lines
-    .map((segment) => segment.split('\n').filter((line) => line && !line.startsWith('#')))
+    .map((segment) => segment.split(originalEOL).filter((line) => line && !line.startsWith('#')))
     // Maps segment name to list of valid gitignore lines
     .reduce((map, segment) => {
       const segmentName = (segment.shift() || '').trim();
diff --git a/package.json b/package.json
index cb378d1..9d69375 100644
--- a/package.json
+++ b/package.json
@@ -1,6 +1,6 @@
 {
   "name": "@salesforce/dev-scripts",
-  "version": "9.1.2",
+  "version": "9.1.3-dev.2",
   "description": "Standardize package.json scripts and config files for Salesforce projects.",
   "repository": "forcedotcom/dev-scripts",
   "bin": {
diff --git a/utils/standardize-files.js b/utils/standardize-files.js
index 0399acb..b47f4f9 100644
--- a/utils/standardize-files.js
+++ b/utils/standardize-files.js
@@ -83,11 +83,20 @@ function writeGitignore(targetDir) {
     const relevantPatterns = IGNORES.filter((entry) => !entry.plugin || (entry.plugin && isAPlugin));
     let original = readFileSync(gitignoreTargetPath, 'utf-8');
 
+    // respect the file EOL (`CRLF` or `LF`).
+    //
+    // we can't use node's `os.EOL` because that assumes:
+    //   * unix only uses `CL`
+    //   * win only uses `CRLF`
+    //
+    // when all 4 scenarios are completely valid
+    const originalEOL = original.includes('\r\n') ? '\r\n' : '\n';
+
     const segments = original
       // Segments are defined by "# --" in the gitignore
       .split('# --')
       // Turn each segment into list of valid gitignore lines
-      .map((segment) => segment.split('\n'))
+      .map((segment) => segment.split(originalEOL))
       // Maps segment name to list of valid gitignore lines
       .reduce((map, segment) => {
         const segmentName = (segment.shift() || '').trim();
@@ -112,7 +121,7 @@ function writeGitignore(targetDir) {
       }
 
       if (needsWrite) {
-        writeFileSync(gitignoreTargetPath, `${original}\n${toAdd.join('\n')}`);
+        writeFileSync(gitignoreTargetPath, `${original}${originalEOL}${toAdd.join(originalEOL)}`);
         return gitignoreTargetPath;
       }
     } else {
@@ -135,11 +144,11 @@ function writeGitignore(targetDir) {
         for (const [section, lines] of Object.entries(updatedSegments)) {
           if (lines.length === 0) continue;
           original = original.replace(
-            `# -- ${section}\n${segments[section].join('\n')}`,
-            `# -- ${section}\n${[...segments[section], ...lines, '\n'].join('\n')}`
+            `# -- ${section}${originalEOL}${segments[section].join(originalEOL)}`,
+            `# -- ${section}${originalEOL}${[...segments[section], ...lines, originalEOL].join(originalEOL)}`
           );
         }
-        writeFileSync(gitignoreTargetPath, original.trimEnd() + '\n');
+        writeFileSync(gitignoreTargetPath, original.trimEnd() + originalEOL);
         return gitignoreTargetPath;
       }
     }