diff --git a/aqhome/data/datafile_direct.c b/aqhome/data/datafile_direct.c
index 44a8eb4..b066c74 100644
--- a/aqhome/data/datafile_direct.c
+++ b/aqhome/data/datafile_direct.c
@@ -72,7 +72,7 @@ AQH_DATAFILE *AQH_DataFileDirect_new(const char *fileName, uint64_t valueId)
 
 
 
-void _cbFreeData(void *bp, void *p)
+void _cbFreeData(GWEN_UNUSED void *bp, void *p)
 {
   AQH_DATAFILE_DIRECT *xdf;