diff --git a/src/cmake/externalpackages.cmake b/src/cmake/externalpackages.cmake
index 8b1aab3f84..560c1ab5d9 100644
--- a/src/cmake/externalpackages.cmake
+++ b/src/cmake/externalpackages.cmake
@@ -133,7 +133,9 @@ checked_find_package (Freetype
                       DEFINITIONS USE_FREETYPE=1 )
 
 checked_find_package (yaml-cpp
-                      VERSION_MIN 0.6.0 )  # Used by OpenColorIO
+                      VERSION_MIN 0.6.0 
+                      ISDEPOF OpenColorIO
+                      )  # Used by OpenColorIO
 
 checked_find_package (OpenColorIO REQUIRED
                       VERSION_MIN 2.2