diff --git a/src/XrdS3.cmake b/src/XrdS3.cmake
index 4a25aea0fef..cc5e8c9454f 100644
--- a/src/XrdS3.cmake
+++ b/src/XrdS3.cmake
@@ -61,6 +61,7 @@ if (BUILD_S3)
             XrdPosixPreload
             tinyxml2
 	    stdc++fs
+	    jsoncpp
             ${CMAKE_DL_LIBS}
             ${CMAKE_THREAD_LIBS_INIT})