diff --git a/src/OS/FoundationClasses.tcl b/src/OS/FoundationClasses.tcl
index c418a4d4e0..d85848c575 100755
--- a/src/OS/FoundationClasses.tcl
+++ b/src/OS/FoundationClasses.tcl
@@ -25,7 +25,10 @@ proc FoundationClasses:toolkits { } {
 ;# Autres UDs a prendre.
 ;#
 proc FoundationClasses:ressources { } {
-        return [list [list both r OS {} ]] \
+        return [list \
+	       [list both r OS {} ] \
+	       [list both r UnitsAPI {} ] \
+	       ]
 }
 ;
 ;#