diff --git a/src/Psalm/Internal/Analyzer/Statements/Expression/SimpleTypeInferer.php b/src/Psalm/Internal/Analyzer/Statements/Expression/SimpleTypeInferer.php
index cfd69cb3784..841e6f516aa 100644
--- a/src/Psalm/Internal/Analyzer/Statements/Expression/SimpleTypeInferer.php
+++ b/src/Psalm/Internal/Analyzer/Statements/Expression/SimpleTypeInferer.php
@@ -12,6 +12,7 @@
 use Psalm\Internal\Analyzer\Statements\Expression\BinaryOp\ArithmeticOpAnalyzer;
 use Psalm\Internal\Analyzer\StatementsAnalyzer;
 use Psalm\Internal\Provider\NodeDataProvider;
+use Psalm\Internal\Scanner\FileScanner;
 use Psalm\Internal\Type\TypeCombiner;
 use Psalm\StatementsSource;
 use Psalm\Storage\ClassConstantStorage;
@@ -337,7 +338,10 @@ public static function infer(
                     return Type::getLiteralClassString($const_fq_class_name, true);
                 }
 
-                if ($existing_class_constants === null || $existing_class_constants === []) {
+                if ($file_source instanceof  FileScanner
+                    && $existing_class_constants === null
+                    || $existing_class_constants === []
+                ) {
                     try {
                         $foreign_class_constant = $codebase->classlikes->getClassConstantType(
                             $const_fq_class_name,