diff --git a/externals/cryptopp/CMakeLists.txt b/externals/cryptopp/CMakeLists.txt
index eb66c847ea..81c51f403a 100644
--- a/externals/cryptopp/CMakeLists.txt
+++ b/externals/cryptopp/CMakeLists.txt
@@ -127,6 +127,8 @@ set(cryptopp_SOURCES
         cryptopp/ccm.cpp
         cryptopp/cpu.cpp
         cryptopp/cryptlib.cpp
+        cryptopp/des.cpp
+        cryptopp/dessp.cpp
         cryptopp/dll.cpp
         cryptopp/ec2n.cpp
         cryptopp/ecp.cpp