diff --git a/tests/malloc_test.cpp b/tests/malloc_test.cpp
index 1386e30..b5948c3 100644
--- a/tests/malloc_test.cpp
+++ b/tests/malloc_test.cpp
@@ -1399,7 +1399,7 @@
   ASSERT_EQ(0, sem_post(&sem));
 
   int my_tagged_addr_ctrl = prctl(PR_GET_TAGGED_ADDR_CTRL, 0, 0, 0, 0);
-  ASSERT_EQ(PR_MTE_TCF_NONE, my_tagged_addr_ctrl & PR_MTE_TCF_MASK);
+  ASSERT_EQ(static_cast<unsigned long>(PR_MTE_TCF_NONE), my_tagged_addr_ctrl & PR_MTE_TCF_MASK);
 
   void* retval;
   ASSERT_EQ(0, pthread_join(thread, &retval));