diff --git a/tests/libc_logging_test.cpp b/tests/libc_logging_test.cpp
index d9c615e..5b10ce3 100644
--- a/tests/libc_logging_test.cpp
+++ b/tests/libc_logging_test.cpp
@@ -53,10 +53,10 @@
   __libc_format_buffer(buf, sizeof(buf), "a%db", -8123);
   EXPECT_STREQ("a-8123b", buf);
 
-  __libc_format_buffer(buf, sizeof(buf), "a%hdb", 0x7fff0010);
+  __libc_format_buffer(buf, sizeof(buf), "a%hdb", static_cast<short>(0x7fff0010));
   EXPECT_STREQ("a16b", buf);
 
-  __libc_format_buffer(buf, sizeof(buf), "a%hhdb", 0x7fffff10);
+  __libc_format_buffer(buf, sizeof(buf), "a%hhdb", static_cast<char>(0x7fffff10));
   EXPECT_STREQ("a16b", buf);
 
   __libc_format_buffer(buf, sizeof(buf), "a%lldb", 0x1000000000LL);