diff --git a/test/UsefulBuf_Tests.h b/test/UsefulBuf_Tests.h
index 976de62..0d06206 100644
--- a/test/UsefulBuf_Tests.h
+++ b/test/UsefulBuf_Tests.h
@@ -1,6 +1,7 @@
 /*==============================================================================
  Copyright (c) 2016-2018, The Linux Foundation.
  Copyright (c) 2018, Laurence Lundblade.
+ Copyright (c) 2021, Arm Limited.
  All rights reserved.
 
 Redistribution and use in source and binary forms, with or without
@@ -45,6 +46,8 @@
 
 const char *  UIBTest_IntegerFormat(void);
 
+#ifndef USEFULBUF_DISABLE_ALL_FLOAT
 const char *  UBUTest_CopyUtil(void);
+#endif /* USEFULBUF_DISABLE_ALL_FLOAT */
 
 #endif