diff --git a/tests/suites/test_suite_ecp.function b/tests/suites/test_suite_ecp.function
index 50a95e1..0c51b10 100644
--- a/tests/suites/test_suite_ecp.function
+++ b/tests/suites/test_suite_ecp.function
@@ -335,7 +335,7 @@
     TEST_ASSERT( mpi_msb( &N ) <= grp.pbits + 3 );
 
     /*
-     * Use mod rather than addition/substraction in case previous test fails
+     * Use mod rather than addition/subtraction in case previous test fails
      */
     TEST_ASSERT( mpi_mod_mpi( &N, &N, &grp.P ) == 0 );
     TEST_ASSERT( mpi_cmp_mpi( &N, &R ) == 0 );