diff --git a/CHANGELOG.md b/CHANGELOG.md
index aee163807c..11a8b2ffb6 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -10,6 +10,7 @@ and this project adheres to [Semantic Versioning](https://semver.org).
 ### Fixed
 
 - Resolve evaluation of utf-8 named ranges in calculation engine [#1522](https://github.com/PHPOffice/PhpSpreadsheet/pull/1522)
+- Fix HLOOKUP on single row [#1512](https://github.com/PHPOffice/PhpSpreadsheet/pull/1512)
 - Fix MATCH when comparing different numeric types [#1521](https://github.com/PHPOffice/PhpSpreadsheet/pull/1521)
 - Fix exact MATCH on ranges with empty cells [#1520](https://github.com/PHPOffice/PhpSpreadsheet/pull/1520)
 
diff --git a/src/PhpSpreadsheet/Calculation/LookupRef.php b/src/PhpSpreadsheet/Calculation/LookupRef.php
index 904eb24b34..6e817006c4 100644
--- a/src/PhpSpreadsheet/Calculation/LookupRef.php
+++ b/src/PhpSpreadsheet/Calculation/LookupRef.php
@@ -807,7 +807,7 @@ public static function HLOOKUP($lookup_value, $lookup_array, $index_number, $not
             return Functions::REF();
         }
         $f = array_keys($lookup_array);
-        $firstRow = array_pop($f);
+        $firstRow = reset($f);
         if ((!is_array($lookup_array[$firstRow])) || ($index_number > count($lookup_array))) {
             return Functions::REF();
         }
diff --git a/tests/data/Calculation/LookupRef/HLOOKUP.php b/tests/data/Calculation/LookupRef/HLOOKUP.php
index 644ddeba7c..b880f24705 100644
--- a/tests/data/Calculation/LookupRef/HLOOKUP.php
+++ b/tests/data/Calculation/LookupRef/HLOOKUP.php
@@ -275,6 +275,19 @@
         2,
         true,
     ],
+    [
+        3,
+        3,
+        [
+            [
+                1,
+                2,
+                3,
+            ],
+        ],
+        1,
+        true,
+    ],
     [
         5,
         'x',