diff --git a/projects/packages/constants/.phan/baseline.php b/projects/packages/constants/.phan/baseline.php
index 52e0bc845738c..3df50068147ad 100644
--- a/projects/packages/constants/.phan/baseline.php
+++ b/projects/packages/constants/.phan/baseline.php
@@ -8,12 +8,9 @@
  * (can be combined with --load-baseline)
  */
 return [
-    // # Issue statistics:
-    // PhanTypeMismatchArgumentProbablyReal : 3 occurrences
-
+    // This baseline has no suppressions
     // Currently, file_suppressions and directory_suppressions are the only supported suppressions
     'file_suppressions' => [
-        'tests/php/test-constants.php' => ['PhanTypeMismatchArgumentProbablyReal'],
     ],
     // 'directory_suppressions' => ['src/directory_name' => ['PhanIssueName1', 'PhanIssueName2']] can be manually added if needed.
     // (directory_suppressions will currently be ignored by subsequent calls to --save-baseline, but may be preserved in future Phan releases)
diff --git a/projects/packages/constants/changelog/fix-phan-issues-in-constants-pkg b/projects/packages/constants/changelog/fix-phan-issues-in-constants-pkg
new file mode 100644
index 0000000000000..d592e0686c904
--- /dev/null
+++ b/projects/packages/constants/changelog/fix-phan-issues-in-constants-pkg
@@ -0,0 +1,4 @@
+Significance: patch
+Type: fixed
+
+Fix phpdoc type on `Constants::set_constant()` value parameter.
diff --git a/projects/packages/constants/src/class-constants.php b/projects/packages/constants/src/class-constants.php
index 3aca201c1b9f3..45768a941c66a 100644
--- a/projects/packages/constants/src/class-constants.php
+++ b/projects/packages/constants/src/class-constants.php
@@ -91,8 +91,8 @@ public static function get_constant( $name ) {
 	/**
 	 * Sets the value of the "constant" within constants Manager.
 	 *
-	 * @param string $name The name of the constant.
-	 * @param scalar $value The value of the constant.
+	 * @param string                           $name The name of the constant.
+	 * @param int|float|string|bool|array|null $value The value of the constant.
 	 */
 	public static function set_constant( $name, $value ) {
 		self::$set_constants[ $name ] = $value;