diff --git a/composer.json b/composer.json
index f558f158c..56a0fa19a 100644
--- a/composer.json
+++ b/composer.json
@@ -20,6 +20,7 @@
         "ext-json": "*",
         "ext-libxml": "*",
         "ext-tokenizer": "*",
+        "ext-mbstring": "*",
         "amphp/amp": "^2.1",
         "amphp/byte-stream": "^1.5",
         "composer/package-versions-deprecated": "^1.8.0",
diff --git a/src/Psalm/Internal/Analyzer/Statements/Block/IfAnalyzer.php b/src/Psalm/Internal/Analyzer/Statements/Block/IfAnalyzer.php
index 87398b88c..d677b5b03 100644
--- a/src/Psalm/Internal/Analyzer/Statements/Block/IfAnalyzer.php
+++ b/src/Psalm/Internal/Analyzer/Statements/Block/IfAnalyzer.php
@@ -703,7 +703,7 @@ class IfAnalyzer
                         new DocblockTypeContradiction(
                             'if (false) is impossible',
                             new CodeLocation($statements_analyzer, $cond),
-                            'false falsy',
+                            'false falsy'
                         ),
                         $statements_analyzer->getSuppressedIssues()
                     )) {
@@ -714,7 +714,7 @@ class IfAnalyzer
                         new TypeDoesNotContainType(
                             'if (false) is impossible',
                             new CodeLocation($statements_analyzer, $cond),
-                            'false falsy',
+                            'false falsy'
                         ),
                         $statements_analyzer->getSuppressedIssues()
                     )) {
@@ -727,7 +727,7 @@ class IfAnalyzer
                         new RedundantConditionGivenDocblockType(
                             'if (true) is redundant',
                             new CodeLocation($statements_analyzer, $cond),
-                            'true falsy',
+                            'true falsy'
                         ),
                         $statements_analyzer->getSuppressedIssues()
                     )) {
@@ -738,7 +738,7 @@ class IfAnalyzer
                         new RedundantCondition(
                             'if (true) is redundant',
                             new CodeLocation($statements_analyzer, $cond),
-                            'true falsy',
+                            'true falsy'
                         ),
                         $statements_analyzer->getSuppressedIssues()
                     )) {
diff --git a/tests/StubTest.php b/tests/StubTest.php
index 49c10b808..48a94cd01 100644
--- a/tests/StubTest.php
+++ b/tests/StubTest.php
@@ -48,7 +48,7 @@ class StubTest extends TestCase
                 new Provider\FakeParserCacheProvider()
             )
         );
-        $project_analyzer->setPhpVersion('7.3');
+        $project_analyzer->setPhpVersion('7.4');
 
         $config->setIncludeCollector(new IncludeCollector());
         $config->visitComposerAutoloadFiles($project_analyzer, null);
@@ -1134,13 +1134,13 @@ class StubTest extends TestCase
             )
         );
 
-        $this->project_analyzer->setPhpVersion('7.4');
-
         $file_path = getcwd() . '/src/somefile.php';
 
         $this->addFile(
             $file_path,
-            '<?php'
+            '<?php
+
+                echo "hello";'
         );
 
         $this->expectException(\Psalm\Exception\InvalidClasslikeOverrideException::class);
@@ -1165,13 +1165,13 @@ class StubTest extends TestCase
             )
         );
 
-        $this->project_analyzer->setPhpVersion('7.4');
-
         $file_path = getcwd() . '/src/somefile.php';
 
         $this->addFile(
             $file_path,
-            '<?php'
+            '<?php
+
+                echo "hello";'
         );
 
         $this->expectException(\Psalm\Exception\InvalidMethodOverrideException::class);