diff --git a/library/ecp_curves.c b/library/ecp_curves.c
index c9868f3..6192f6a 100644
--- a/library/ecp_curves.c
+++ b/library/ecp_curves.c
@@ -5432,9 +5432,7 @@
 int mbedtls_ecp_mod_p255_raw(mbedtls_mpi_uint *X, size_t X_Limbs)
 {
 
-    if (X_Limbs > 2*P255_WIDTH) {
-        X_Limbs = 2*P255_WIDTH;
-    } else if (X_Limbs < P255_WIDTH) {
+    if (X_Limbs != 2 * P255_WIDTH) {
         return MBEDTLS_ERR_ECP_BAD_INPUT_DATA;
     }