diff --git a/src/Factory.php b/src/Factory.php
index 99d6474d..19e5bd02 100644
--- a/src/Factory.php
+++ b/src/Factory.php
@@ -31,7 +31,7 @@ public static function fromRuleSet(RuleSet $ruleSet, array $overrideRules = []):
     {
         if (\PHP_VERSION_ID < $ruleSet->targetPhpVersion()) {
             throw new \RuntimeException(\sprintf(
-                'Current PHP version "%s is less than targeted PHP version "%s".',
+                'Current PHP version "%s" is less than targeted PHP version "%s".',
                 \PHP_VERSION_ID,
                 $ruleSet->targetPhpVersion()
             ));
diff --git a/test/Unit/FactoryTest.php b/test/Unit/FactoryTest.php
index 017edb0f..e2f5a574 100644
--- a/test/Unit/FactoryTest.php
+++ b/test/Unit/FactoryTest.php
@@ -51,7 +51,7 @@ public function testFromRuleSetThrowsRuntimeExceptionIfCurrentPhpVersionIsLessTh
 
         $this->expectException(\RuntimeException::class);
         $this->expectExceptionMessage(\sprintf(
-            'Current PHP version "%s is less than targeted PHP version "%s".',
+            'Current PHP version "%s" is less than targeted PHP version "%s".',
             \PHP_VERSION_ID,
             $targetPhpVersion
         ));