diff --git a/src/Bytecode/Instruction/execute.c b/src/Bytecode/Instruction/execute.c
index 9917b84..c64d09a 100644
--- a/src/Bytecode/Instruction/execute.c
+++ b/src/Bytecode/Instruction/execute.c
@@ -729,6 +729,11 @@ struct GroundExecutionResult _GroundBytecodeInstructionExecute(GroundBytecodeIns
             Ground.Log.Error("malloc failed in Ground.Bytecode.Instruction.execute");
             Ground.Flags.error = true;
             return CONTINUE;
+        } else {
+            // forget all values in previous closure 
+            for (GroundSize i = 0; i < function->closure->len; i++) {
+                Ground.Free.BytecodeValue(&function->closure->heap[i]);
+            }
         }
 
         for (GroundSize i = 0; i < heap->len; i++) {
@@ -785,6 +790,12 @@ struct GroundExecutionResult _GroundBytecodeInstructionExecute(GroundBytecodeIns
         // And store the result 
         HEAP_SET(heap, instruction->args.at[instruction->args.len - 1], result);
 
+        // Clean up the new heap 
+        for (GroundSize i = 0; i < newHeap.len; i++) {
+            Ground.Free.BytecodeValue(&newHeap.heap[i]);
+        }
+        free(newHeap.heap);
+
         return CONTINUE;
     }
     CALLMETHOD: {