--- a/src/osgPlugins/curl/CMakeLists.txt
+++ b/src/osgPlugins/curl/CMakeLists.txt
@@ -35,3 +35,3 @@
         ADD_DEFINITIONS(-DCURL_STATICLIB)
-        SET(TARGET_EXTERNAL_LIBRARIES ${TARGET_EXTERNAL_LIBRARIES} ws2_32 winmm wldap32)
+        SET(TARGET_EXTERNAL_LIBRARIES ${TARGET_EXTERNAL_LIBRARIES} ws2_32 winmm wldap32 crypt32)
     ENDIF()