diff --git a/ports/websocketpp/CONTROL b/ports/websocketpp/CONTROL
index c11e64d3e..f812dc565 100644
--- a/ports/websocketpp/CONTROL
+++ b/ports/websocketpp/CONTROL
@@ -1,3 +1,4 @@
 Source: websocketpp
 Version: 0.7.0
+Build-Depends: zlib, openssl, boost
 Description: Library that implements RFC6455 The WebSocket Protocol
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