diff --git a/src/Psalm/Internal/Analyzer/Statements/Expression/AssertionFinder.php b/src/Psalm/Internal/Analyzer/Statements/Expression/AssertionFinder.php
index eb537d018e2..1cd6ed62f41 100644
--- a/src/Psalm/Internal/Analyzer/Statements/Expression/AssertionFinder.php
+++ b/src/Psalm/Internal/Analyzer/Statements/Expression/AssertionFinder.php
@@ -3687,6 +3687,7 @@ private static function getArrayKeyExistsAssertions(
                     }
                 } elseif (($expr->getArgs()[0]->value instanceof PhpParser\Node\Expr\Variable
                         || $expr->getArgs()[0]->value instanceof PhpParser\Node\Expr\PropertyFetch
+                        || $expr->getArgs()[0]->value instanceof PhpParser\Node\Expr\StaticPropertyFetch
                     )
                     && $source instanceof StatementsAnalyzer
                     && ($first_var_type = $source->node_data->getType($expr->getArgs()[0]->value))