diff --git a/src/osgEarth/CMakeLists.txt b/src/osgEarth/CMakeLists.txt
index 0f8726059c..224a37573c 100644
--- a/src/osgEarth/CMakeLists.txt
+++ b/src/osgEarth/CMakeLists.txt
@@ -980,6 +980,10 @@ IF (TRACY_FOUND)
     LINK_WITH_VARIABLES(${LIB_NAME} TRACY_LIBRARY)
 ENDIF(TRACY_FOUND)
 
+if(UNIX)
+    target_link_libraries(${LIB_NAME} PUBLIC Threads::Threads)
+endif()
+
 OPTION(NRL_STATIC_LIBRARIES "Link osgEarth against static GDAL and cURL, including static OpenSSL, Proj4, JPEG, PNG, and TIFF." OFF)
 if(NOT NRL_STATIC_LIBRARIES)
   LINK_WITH_VARIABLES(${LIB_NAME} OSG_LIBRARY OSGUTIL_LIBRARY OSGSIM_LIBRARY OSGDB_LIBRARY OSGVIEWER_LIBRARY OSGTEXT_LIBRARY OSGGA_LIBRARY OSGSHADOW_LIBRARY CURL_LIBRARY GDAL_LIBRARY OSGMANIPULATOR_LIBRARY)