diff --git a/tests/src/helpers.c b/tests/src/helpers.c
index 2c01a58..d88ef43 100644
--- a/tests/src/helpers.c
+++ b/tests/src/helpers.c
@@ -287,7 +287,7 @@
 void mbedtls_test_err_add_check( int high, int low,
                                  const char *file, int line )
 {
-    if ( high < -0x0FFF && low > -0x007F )
+    if ( high > -0x1000 || low < -0x007F )
     {
         mbedtls_fprintf( stderr, "\nIncorrect error code addition at %s:%d\n",
                                 file, line );