diff --git a/CMakeLists.txt b/CMakeLists.txt
index 88afefe..37f88e0 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -301,7 +301,7 @@ tde_add_library( tdevncclient STATIC_PIC AUTOMOC
   SOURCES
     ${LIBVNCCLIENT_SOURCES}
   LINK
-    ${ADDITIONAL_LIBS} ${ZLIB_LIBRARIES} ${JPEG_LIBRARIES} ${GNUTLS_LIBRARIES}
+    pthread ${ADDITIONAL_LIBS} ${ZLIB_LIBRARIES} ${JPEG_LIBRARIES} ${GNUTLS_LIBRARIES} ${OPENSSL_LIBRARIES}
 )
 
 ##### tdevncserver (static) ########################