diff --git a/tests/valgrind-suppressions b/tests/valgrind-suppressions
index a479e025..c0068176 100644
--- a/tests/valgrind-suppressions
+++ b/tests/valgrind-suppressions
@@ -7,6 +7,36 @@
    fun:url_parse
 }
 
+{
+   False positive in libidn.so
+   Memcheck:Addr8
+   fun:strncmp
+   fun:is_dst
+   ...
+   fun:fillin_rpath.isra.0
+   fun:decompose_rpath
+   fun:_dl_map_object
+   fun:openaux
+   fun:_dl_catch_exception
+   fun:_dl_map_object_deps
+   fun:dl_open_worker
+}
+
+{
+   False positive in libidn.so
+   Memcheck:Addr16
+   fun:strncmp
+   ...
+   fun:fillin_rpath.isra.0
+   fun:decompose_rpath
+   fun:_dl_map_object
+   fun:openaux
+   fun:_dl_catch_exception
+   fun:_dl_map_object_deps
+   fun:dl_open_worker
+   fun:_dl_catch_exception
+}
+
 {
    Valgrind 3.4 bug suppression
    Memcheck:Cond