diff --git a/test/lib/CANtestLib.vhd b/test/lib/CANtestLib.vhd
index 1bcfe2e4caa1118ba518e2015c2d0d0a09f66413..457a7b468fe8ff75ac742ca4db63671f8d73bf0f 100644
--- a/test/lib/CANtestLib.vhd
+++ b/test/lib/CANtestLib.vhd
@@ -2449,19 +2449,19 @@ package body CANtestLib is
     end procedure;
 
 
-    impure function aval_is_invalid_burst_size(
+    impure function aval_is_valid_burst_size(
         constant data_length    :       natural
     ) return boolean
     is
     begin
-        if ((data_length mod 4) = 0) then
+        if ((data_length mod 32) /= 0) then
             warning("Invalid Avalon Burst size: "
                     & integer'image(data_length) &
                     " Burst size should be 32 bit aligned!");
             return false;
         end if;
 
-        if ((data_length / 4) > 64) then
+        if ((data_length / 32) > 64) then
             warning("Invalid Avalon Burst size: "
                     & integer'image(data_length) &
                     " Burst size should not be larger than 64 words! " &
@@ -2490,7 +2490,7 @@ package body CANtestLib is
             return;
         end if;
         
-        if (aval_is_invalid_burst_size(w_data'length)) then
+        if (not aval_is_valid_burst_size(w_data'length)) then
             return;
         end if;
 
@@ -2543,7 +2543,7 @@ package body CANtestLib is
             return;
         end if;
         
-        if (aval_is_invalid_burst_size(r_data'length)) then
+        if (not aval_is_valid_burst_size(r_data'length)) then
             return;
         end if;