diff --git a/tests/poolTests.c b/tests/poolTests.c
index 6a058a5a3..9661b5299 100644
--- a/tests/poolTests.c
+++ b/tests/poolTests.c
@@ -105,7 +105,8 @@ void waitLongFn(void *opaque) {
 static int testThreadReduction_internal(POOL_ctx* ctx, poolTest_t test)
 {
     int const nbWaits = 16;
-    UTIL_time_t startTime, time4threads, time2threads;
+    UTIL_time_t startTime;
+    U64 time4threads, time2threads;
 
     test.val = 0;
     test.max = nbWaits;