diff --git a/src/Analyser/NodeScopeResolver.php b/src/Analyser/NodeScopeResolver.php
index 2adef28f931..d6c6832f85f 100644
--- a/src/Analyser/NodeScopeResolver.php
+++ b/src/Analyser/NodeScopeResolver.php
@@ -4536,7 +4536,7 @@ private function inferForLoopExpressions(For_ $stmt, Expr $lastCondExpr, Mutatin
 				&& $lastCondExpr->left instanceof Variable
 				&& $lastCondExpr->right instanceof FuncCall
 				&& $lastCondExpr->right->name instanceof Name
-				&& $lastCondExpr->right->name->toLowerString() === 'count'
+				&& in_array($lastCondExpr->right->name->toLowerString(), ['count', 'sizeof'], true)
 				&& count($lastCondExpr->right->getArgs()) > 0
 				&& $lastCondExpr->right->getArgs()[0]->value instanceof Variable
 				&& is_string($stmt->init[0]->var->name)
@@ -4557,7 +4557,7 @@ private function inferForLoopExpressions(For_ $stmt, Expr $lastCondExpr, Mutatin
 				&& $lastCondExpr->right instanceof Variable
 				&& $lastCondExpr->left instanceof FuncCall
 				&& $lastCondExpr->left->name instanceof Name
-				&& $lastCondExpr->left->name->toLowerString() === 'count'
+				&& in_array($lastCondExpr->left->name->toLowerString(), ['count', 'sizeof'], true)
 				&& count($lastCondExpr->left->getArgs()) > 0
 				&& $lastCondExpr->left->getArgs()[0]->value instanceof Variable
 				&& is_string($stmt->init[0]->var->name)