diff --git a/dagger/por/backends/backend_constantine.nim b/dagger/por/backends/backend_constantine.nim
index e868b56b..19453f32 100644
--- a/dagger/por/backends/backend_constantine.nim
+++ b/dagger/por/backends/backend_constantine.nim
@@ -34,6 +34,7 @@ export matchingBigInt
 export getNonResidueFp
 
 when defined(debugConstantine):
+  import   constantine/math/config/type_bigint
   export `$`
 
 const C = BLS12_381