diff --git a/src/Cose.c b/src/Cose.c
index a30dc10..f0552ba 100644
--- a/src/Cose.c
+++ b/src/Cose.c
@@ -221,6 +221,7 @@
 
 bool _COSE_SetExternal(COSE * pcose, const byte * pbExternalData, size_t cbExternalData, cose_errback * perr)
 {
+	(void) perr;
 	pcose->m_pbExternal = pbExternalData;
 	pcose->m_cbExternal = cbExternalData;