diff --git a/lib/vtls/schannel_verify.c b/lib/vtls/schannel_verify.c
index 0f44dad42c..5a7092a21a 100644
--- a/lib/vtls/schannel_verify.c
+++ b/lib/vtls/schannel_verify.c
@@ -214,7 +214,7 @@ static CURLcode add_certs_to_store(HCERTSTORE trust_store,
                              NULL,
                              NULL,
                              NULL,
-                             &cert_context)) {
+                             (const void **)&cert_context)) {
 
           failf(data,
                 "schannel: failed to extract certificate from CA file "