diff --git a/backend-simulators/pim/pim-simulator/src/lib/send_recv.rs b/backend-simulators/pim/pim-simulator/src/lib/send_recv.rs
index 351f8d0..c6322fd 100644
--- a/backend-simulators/pim/pim-simulator/src/lib/send_recv.rs
+++ b/backend-simulators/pim/pim-simulator/src/lib/send_recv.rs
@@ -107,12 +107,17 @@ pub fn handle_send_recv(
             let receiver: usize = imm_core.try_into().expect("imm_core can not be negative");
             assert_ne!(receiver, 0, "Host can not use receive");
             send_recv.sending[sender] = Some(SendRecvInfo::new(sender, receiver, address, imm_len));
-            transfer_memory(
+            let transfered = transfer_memory(
                 cpu,
                 core_instructions,
                 send_recv.sending[sender],
                 send_recv.receiving[receiver],
-            )
+            );
+            if transfered {
+                send_recv.sending[sender] = None;
+                send_recv.receiving[receiver] = None;
+            }
+            return transfered;
         }
         InstructionStatus::Reciving(instruction_data) => {
             let (core_idx, imm_core) = instruction_data.get_core_immcore();
@@ -131,12 +136,17 @@ pub fn handle_send_recv(
             assert_ne!(sender, 0, "Host can not use send");
             send_recv.receiving[receiver] =
                 Some(SendRecvInfo::new(receiver, sender, address, imm_len));
-            transfer_memory(
+            let transfered = transfer_memory(
                 cpu,
                 core_instructions,
                 send_recv.sending[sender],
                 send_recv.receiving[receiver],
-            )
+            );
+            if transfered {
+                send_recv.sending[sender] = None;
+                send_recv.receiving[receiver] = None;
+            }
+            return transfered;
         }
         _ => false,
     }