diff --git a/src/dynamicdnsmngr.c b/src/dynamicdnsmngr.c
index 91f976b7d0c4f488290e4fab6303411d718ea9d9..a677b92f55120e9c5161d01a882cb982a955feb9 100644
--- a/src/dynamicdnsmngr.c
+++ b/src/dynamicdnsmngr.c
@@ -722,6 +722,8 @@ static int get_DynamicDNSServer_Protocol(char *refparam, struct dmctx *ctx, void
 
 static int set_DynamicDNSServer_Protocol(char *refparam, struct dmctx *ctx, void *data, char *instance, char *value, int action)
 {
+	char *SupportedProtocols[] = {"HTTP", "HTTPS", NULL};
+
 	switch (action)	{
 		case VALUECHECK:
 			if (bbfdm_validate_string(ctx, value, -1, -1, SupportedProtocols, NULL))