diff --git a/src/TOP/TRP/trctrp.F90 b/src/TOP/TRP/trctrp.F90
index e01298e1a28e5377bd45e1b4ebcd0fcb55dbb9e1..03b07bdc86c1562e9707bcbc5800c4717f47e9ae 100644
--- a/src/TOP/TRP/trctrp.F90
+++ b/src/TOP/TRP/trctrp.F90
@@ -33,6 +33,9 @@ MODULE trctrp
 
 #if defined key_agrif
    USE agrif_top_sponge ! tracers sponges
+# if defined key_RK3
+   USE agrif_top_interp
+# endif
 #endif
 
    IMPLICIT NONE