diff --git a/library/timing.c b/library/timing.c
index a8c1371..aee9dd4 100644
--- a/library/timing.c
+++ b/library/timing.c
@@ -429,25 +429,25 @@
     if( verbose != 0 )
         mbedtls_printf( "  TIMING test #2 (set/get_delay        ): " );
 
-    for( a = 100; a <= 200; a += 100 )
+    for( a = 200; a <= 400; a += 200 )
     {
-        for( b = 100; b <= 200; b += 100 )
+        for( b = 200; b <= 400; b += 200 )
         {
             mbedtls_timing_set_delay( &ctx, a, a + b );
 
-            busy_msleep( a - a / 10 );
+            busy_msleep( a - a / 8 );
             if( mbedtls_timing_get_delay( &ctx ) != 0 )
                 FAIL;
 
-            busy_msleep( a / 5 );
+            busy_msleep( a / 4 );
             if( mbedtls_timing_get_delay( &ctx ) != 1 )
                 FAIL;
 
-            busy_msleep( b - a / 5 );
+            busy_msleep( b - a / 8 - b / 8 );
             if( mbedtls_timing_get_delay( &ctx ) != 1 )
                 FAIL;
 
-            busy_msleep( b / 5 );
+            busy_msleep( b / 4 );
             if( mbedtls_timing_get_delay( &ctx ) != 2 )
                 FAIL;
         }