diff --git a/src/main.cpp b/src/main.cpp
index fa84f54..16ebad4 100644
--- a/src/main.cpp
+++ b/src/main.cpp
@@ -46,8 +46,13 @@ DWORD WINAPI recvTh(LPVOID)
     auto buf = std::make_unique<char[]>(BUF_SIZE);
     printf("Started thread\n");
 
-    u_long iMode = 1;
-    ioctlsocket(sock, FIONBIO, &iMode);
+    u_long iMode = 0;
+    int ioctlResult = ioctlsocket(sock, FIONBIO, &iMode);
+    if (ioctlResult != 0)
+    {
+        printf("ioctlsocket error: %d\n", ioctlResult);
+        return 1;
+    }
 
     sockaddr_in sender{};
 	int senderSize = sizeof(sender);
@@ -83,6 +88,8 @@ DWORD WINAPI recvTh(LPVOID)
 
         Sleep(1);
     }
+
+    return 0;
 }
 
 int main(int, char**)