diff --git a/test/UsefulBuf_Tests.c b/test/UsefulBuf_Tests.c
index ccd07b8..3ab3557 100644
--- a/test/UsefulBuf_Tests.c
+++ b/test/UsefulBuf_Tests.c
@@ -815,7 +815,7 @@
 #endif /* USEFULBUF_DISABLE_ALL_FLOAT */
 
 
-const char *UBAdvanceTest()
+const char *UBAdvanceTest(void)
 {
    #define ADVANCE_TEST_SIZE 10
    UsefulOutBuf_MakeOnStack(UOB, ADVANCE_TEST_SIZE);