diff --git a/packages/safe-chain/src/shell-integration/helpers.js b/packages/safe-chain/src/shell-integration/helpers.js
index e3320a1..d6c19d7 100644
--- a/packages/safe-chain/src/shell-integration/helpers.js
+++ b/packages/safe-chain/src/shell-integration/helpers.js
@@ -30,7 +30,7 @@ export function removeLinesMatchingPattern(filePath, pattern, eol) {
   eol = eol || os.EOL;
 
   const fileContent = fs.readFileSync(filePath, "utf-8");
-  const lines = fileContent.split(/[\r\n\u2028\u2029]+/);
+  const lines = fileContent.split(/[\r\n\u2028\u2029]/);
   const updatedLines = lines.filter((line) => !shouldRemoveLine(line, pattern));
   fs.writeFileSync(filePath, updatedLines.join(eol), "utf-8");
 }
diff --git a/packages/safe-chain/src/shell-integration/supported-shells/zsh.spec.js b/packages/safe-chain/src/shell-integration/supported-shells/zsh.spec.js
index 95c12ac..99106ec 100644
--- a/packages/safe-chain/src/shell-integration/supported-shells/zsh.spec.js
+++ b/packages/safe-chain/src/shell-integration/supported-shells/zsh.spec.js
@@ -222,5 +222,24 @@ describe("Zsh shell integration", () => {
       );
       assert.ok(content.includes("alias ls="));
     });
+
+    it("should respect empty lines and comments", () => {
+      const initialContent = [
+        "#!/bin/zsh",
+        "",
+        "# Some comment",
+        "",
+        "",
+        "",
+        "# Another comment",
+      ].join("\n");
+
+      fs.writeFileSync(mockStartupFile, initialContent, "utf-8");
+
+      zsh.teardown(knownAikidoTools);
+
+      const content = fs.readFileSync(mockStartupFile, "utf-8");
+      assert.strictEqual(content, initialContent);
+    });
   });
 });