diff --git a/lib/ini.js b/lib/ini.js
index 0e8623e..beb390d 100644
--- a/lib/ini.js
+++ b/lib/ini.js
@@ -140,7 +140,9 @@ const decode = (str, opt = {}) => {
       duplicates[keyRaw] = (duplicates?.[keyRaw] || 0) + 1
       isArray = duplicates[keyRaw] > 1
     }
-    const key = isArray ? keyRaw.slice(0, -2) : keyRaw
+    const key = isArray && keyRaw.endsWith('[]')
+      ? keyRaw.slice(0, -2) : keyRaw
+
     if (key === '__proto__') {
       continue
     }
diff --git a/tap-snapshots/test/duplicate-properties.js.test.cjs b/tap-snapshots/test/duplicate-properties.js.test.cjs
index 4a88d10..7feb707 100644
--- a/tap-snapshots/test/duplicate-properties.js.test.cjs
+++ b/tap-snapshots/test/duplicate-properties.js.test.cjs
@@ -11,12 +11,12 @@ Null Object {
     "three",
   ],
   "ar[]": "one",
-  "b": Array [
+  "brr": Array [
+    "1",
     "2",
     "3",
     "3",
   ],
-  "brr": "1",
   "str": "3",
   "zr": "123",
   "zr[]": "deedee",