diff --git a/tests/suites/helpers.function b/tests/suites/helpers.function
index 56ae629..32b1b79 100644
--- a/tests/suites/helpers.function
+++ b/tests/suites/helpers.function
@@ -455,13 +455,13 @@
     test_info.filename = filename;
 }
 
-int hexcmp( uint8_t * a, uint8_t * b, uint32_t a_len, uint32_t b_len)
+int hexcmp( uint8_t * a, uint8_t * b, uint32_t a_len, uint32_t b_len )
 {
     int ret = 0;
     uint32_t i = 0;
 
     if ( a_len != b_len )
-        return( a_len - b_len );
+        return( -1 );
 
     for( i = 0; i < a_len; i++ )
     {