diff --git a/src/osgAnimation/CMakeLists.txt b/src/osgAnimation/CMakeLists.txt
index cf9d7b380..3e7e9cf85 100644
--- a/src/osgAnimation/CMakeLists.txt
+++ b/src/osgAnimation/CMakeLists.txt
@@ -51,6 +51,8 @@ ADD_LIBRARY(${LIB_NAME}
 
 LINK_INTERNAL(${LIB_NAME}
     osg
+    OpenThreads
 )
+
 LINK_CORELIB_DEFAULT(${LIB_NAME})
 INCLUDE(ModuleInstall OPTIONAL)