diff --git a/src/libsync/clientsideencryption.cpp b/src/libsync/clientsideencryption.cpp
index ba3430042..c9a655278 100644
--- a/src/libsync/clientsideencryption.cpp
+++ b/src/libsync/clientsideencryption.cpp
@@ -1,3 +1,5 @@
+#define OPENSSL_SUPPRESS_DEPRECATED
+
 #include "clientsideencryption.h"
 
 #include <openssl/rsa.h>