diff --git a/test/cpp/src/TestClient.cpp b/test/cpp/src/TestClient.cpp
index 4fcf6b1..897153a 100644
--- a/test/cpp/src/TestClient.cpp
+++ b/test/cpp/src/TestClient.cpp
@@ -42,7 +42,7 @@
 // Current time, microseconds since the epoch
 uint64_t now()
 {
-  long long ret;
+  int64_t ret;
   struct timeval tv;
 
   gettimeofday(&tv, NULL);