diff --git a/internal/weave/sockets/client_socket_test.cc b/internal/weave/sockets/client_socket_test.cc
index fc7fab28..3416cdac 100644
--- a/internal/weave/sockets/client_socket_test.cc
+++ b/internal/weave/sockets/client_socket_test.cc
@@ -227,7 +227,7 @@ TEST_F(ClientSocketTest, TestClientServerPacketSizeHigher) {
 TEST_F(ClientSocketTest, TestConnectInitialData) {
   std::string initial_data = "12";
   RunConnect(2, 2, initial_data);
-  EXPECT_EQ(messages_read_.size(), 1);
+  ASSERT_EQ(messages_read_.size(), 1);
   EXPECT_EQ(messages_read_.front(), initial_data);
 }