diff --git a/psalm.xml.dist b/psalm.xml.dist
index 44f67aa..2224d90 100755
--- a/psalm.xml.dist
+++ b/psalm.xml.dist
@@ -11,6 +11,7 @@
 
     <issueHandlers>
         <LessSpecificReturnType errorLevel="info" />
+	<UnnecessaryVarAnnotation errorLevel="suppress" />
     </issueHandlers>
 
     <plugins>
diff --git a/src/VersionUtils.php b/src/VersionUtils.php
index c9a21d0..9f89ecd 100644
--- a/src/VersionUtils.php
+++ b/src/VersionUtils.php
@@ -8,6 +8,7 @@
 
 abstract class VersionUtils
 {
+    /** @param "!="|"<"|"<="|"<>"|"="|"=="|">"|">=" $op */
     public static function packageVersionIs(string $package, string $op, string $ref): bool
     {
         try {
diff --git a/tests/acceptance/Prophecy.feature b/tests/acceptance/Prophecy.feature
index 7fc69c6..5188c85 100644
--- a/tests/acceptance/Prophecy.feature
+++ b/tests/acceptance/Prophecy.feature
@@ -33,7 +33,7 @@ Feature: Prophecy
       {
         /** @return void */
         public function testSomething() {
-          $argument = Argument::that(function () {
+          $_argument = Argument::that(function () {
             return true;
           });
         }
@@ -49,7 +49,7 @@ Feature: Prophecy
       {
         /** @return void */
         public function testSomething() {
-          $argument = Argument::that(function (int $i) {
+          $_argument = Argument::that(function (int $i) {
             return $i > 0;
           });
         }
@@ -65,7 +65,7 @@ Feature: Prophecy
       {
         /** @return void */
         public function testSomething() {
-          $argument = Argument::that(function (int $i, int $j, int $k) {
+          $_argument = Argument::that(function (int $i, int $j, int $k) {
             return ($i + $j + $k) > 0;
           });
         }
@@ -81,7 +81,7 @@ Feature: Prophecy
       {
         /** @return void */
         public function testSomething() {
-          $argument = Argument::that(function (): string {
+          $_argument = Argument::that(function (): string {
             return 'hello';
           });
         }
@@ -89,8 +89,8 @@ Feature: Prophecy
       """
     When I run Psalm
     Then I see these errors
-      | Type                  | Message                                                                                                                  |
-      | InvalidScalarArgument | /Argument 1 of Prophecy\\Argument::that expects callable\(mixed...\):bool, (pure-)?Closure\(\):string\(hello\) provided/ |
+      | Type                  | Message                                                                                                                             |
+      | InvalidScalarArgument | /Argument 1 of Prophecy\\Argument::that expects callable\(mixed...\):bool, (pure-)?Closure\(\):(string\(hello\)\|"hello") provided/ |
     And I see no other errors
 
   Scenario: prophesize() provided by ProphecyTrait is generic