Rename mbedtls_mpi_msb to mbedtls_mpi_bitlen
diff --git a/tests/suites/test_suite_ecp.function b/tests/suites/test_suite_ecp.function
index 56b8f61..eee6486 100644
--- a/tests/suites/test_suite_ecp.function
+++ b/tests/suites/test_suite_ecp.function
@@ -175,7 +175,7 @@
     TEST_ASSERT( mbedtls_mpi_mod_mpi( &R, &N, &grp.P ) == 0 );
 
     TEST_ASSERT( grp.modp( &N ) == 0 );
-    TEST_ASSERT( mbedtls_mpi_msb( &N ) <= grp.pbits + 3 );
+    TEST_ASSERT( mbedtls_mpi_bitlen( &N ) <= grp.pbits + 3 );
 
     /*
      * Use mod rather than addition/subtraction in case previous test fails
@@ -371,7 +371,7 @@
     TEST_ASSERT( ret == result );
     if( ret == 0)
     {
-        TEST_ASSERT( mbedtls_mpi_msb( &grp.P ) == (size_t) bits );
+        TEST_ASSERT( mbedtls_mpi_bitlen( &grp.P ) == (size_t) bits );
         TEST_ASSERT( *vbuf == 0x00 );
     }