diff --git a/tests/webtbs/tw0869.pp b/tests/webtbs/tw0869.pp
index f486dcf005..8c54b170e0 100644
--- a/tests/webtbs/tw0869.pp
+++ b/tests/webtbs/tw0869.pp
@@ -1,5 +1,5 @@
 program prueba;
-uses crt;
+uses crt,math;
 var
  i,resultado,exponente:integer;
 begin
diff --git a/tests/webtbs/tw0937.pp b/tests/webtbs/tw0937.pp
index 5fde2b7083..2eba686017 100644
--- a/tests/webtbs/tw0937.pp
+++ b/tests/webtbs/tw0937.pp
@@ -1,7 +1,7 @@
 program test_0_to_power_6;
 
 uses
-  crt;
+  crt,math;
 var
  result,number,exponent : integer;
 begin
diff --git a/tests/webtbs/tw1792.pp b/tests/webtbs/tw1792.pp
index aa031bc50f..916f80e59c 100644
--- a/tests/webtbs/tw1792.pp
+++ b/tests/webtbs/tw1792.pp
@@ -1,3 +1,5 @@
+uses
+  math;
 Begin
  WriteLn(power(2,31));
 end.