diff --git a/library/ecp_curves.c b/library/ecp_curves.c
index 50b4f48..04abdd3 100644
--- a/library/ecp_curves.c
+++ b/library/ecp_curves.c
@@ -4580,7 +4580,8 @@
 #endif
 #if defined(MBEDTLS_ECP_DP_SECP256R1_ENABLED)
 static int ecp_mod_p256(mbedtls_mpi *);
-static int ecp_mod_p256_raw(mbedtls_mpi_uint *Np, size_t Nn);
+MBEDTLS_STATIC_TESTABLE
+int ecp_mod_p256_raw(mbedtls_mpi_uint *Np, size_t Nn);
 #endif
 #if defined(MBEDTLS_ECP_DP_SECP384R1_ENABLED)
 static int ecp_mod_p384(mbedtls_mpi *);
@@ -5113,7 +5114,9 @@
 cleanup:
     return ret;
 }
-static int ecp_mod_p256_raw(mbedtls_mpi_uint *Np, size_t Nn)
+
+MBEDTLS_STATIC_TESTABLE
+int ecp_mod_p256_raw(mbedtls_mpi_uint *Np, size_t Nn)
 {
     if (Nn != 2*((256 + biL - 1)/biL)) {
         return MBEDTLS_ERR_ECP_BAD_INPUT_DATA;
diff --git a/library/ecp_invasive.h b/library/ecp_invasive.h
index 45dd293..8e321ab 100644
--- a/library/ecp_invasive.h
+++ b/library/ecp_invasive.h
@@ -116,6 +116,13 @@
 
 #endif /* MBEDTLS_ECP_DP_SECP224R1_ENABLED */
 
+#if defined(MBEDTLS_ECP_DP_SECP256R1_ENABLED)
+
+MBEDTLS_STATIC_TESTABLE
+int ecp_mod_p256_raw(mbedtls_mpi_uint *Np, size_t Nn);
+
+#endif
+
 #if defined(MBEDTLS_ECP_DP_SECP521R1_ENABLED)
 
 /** Fast quasi-reduction modulo p521 = 2^521 - 1 (FIPS 186-3 D.2.5)