diff --git a/res/res_http_websocket.c b/res/res_http_websocket.c
index 81fa83d1e8db5d9e038bf052d7168afeae352060..fbaf133fa02fc5c5e7bf27fdc437e12a3c7bdf99 100644
--- a/res/res_http_websocket.c
+++ b/res/res_http_websocket.c
@@ -220,7 +220,7 @@ int AST_OPTIONAL_API_NAME(ast_websocket_write)(struct ast_websocket *session, en
 {
 	size_t header_size = 2; /* The minimum size of a websocket frame is 2 bytes */
 	char *frame;
-	uint64_t length = 0;
+	uint64_t length;
 
 	if (actual_length < 126) {
 		length = actual_length;
@@ -235,7 +235,7 @@ int AST_OPTIONAL_API_NAME(ast_websocket_write)(struct ast_websocket *session, en
 	}
 
 	frame = ast_alloca(header_size);
-	memset(frame, 0, sizeof(*frame));
+	memset(frame, 0, header_size);
 
 	frame[0] = opcode | 0x80;
 	frame[1] = length;