diff --git a/java/ql/src/semmle/code/java/dataflow/internal/ContainerFlow.qll b/java/ql/src/semmle/code/java/dataflow/internal/ContainerFlow.qll
index 7f433124256..76656f0f609 100644
--- a/java/ql/src/semmle/code/java/dataflow/internal/ContainerFlow.qll
+++ b/java/ql/src/semmle/code/java/dataflow/internal/ContainerFlow.qll
@@ -180,7 +180,7 @@ private predicate qualifierToMethodStep(Expr tracked, MethodAccess sink) {
   tracked = sink.getQualifier()
 }
 
-private predicate qualifierToArgumentStep(Expr tracked, RValue sink) {
+private predicate qualifierToArgumentStep(Expr tracked, Expr sink) {
   exists(MethodAccess ma, CollectionMethod method |
     method = ma.getMethod() and
     (