diff --git a/platform/src/main/java/org/teavm/platform/plugin/ResourceProgramTransformer.java b/platform/src/main/java/org/teavm/platform/plugin/ResourceProgramTransformer.java
index 51df6b8ef..be7101645 100644
--- a/platform/src/main/java/org/teavm/platform/plugin/ResourceProgramTransformer.java
+++ b/platform/src/main/java/org/teavm/platform/plugin/ResourceProgramTransformer.java
@@ -78,7 +78,11 @@ class ResourceProgramTransformer {
 
     private void removeCastToResource(CastInstruction cast) {
         if (!cast.isWeak() && hierarchy.isSuperType(RESOURCE, cast.getTargetType(), false)) {
-            cast.setWeak(true);
+            AssignInstruction assign = new AssignInstruction();
+            assign.setReceiver(cast.getReceiver());
+            assign.setAssignee(cast.getValue());
+            assign.setLocation(cast.getLocation());
+            cast.replace(assign);
         }
     }