diff --git a/u02/src/tests.cpp b/u02/src/tests.cpp
index f0d205a..cde85bb 100644
--- a/u02/src/tests.cpp
+++ b/u02/src/tests.cpp
@@ -17,7 +17,7 @@
 #include "sweep_line_tool.h"
 #include "util.h"
 
-using Catch::Matchers::WithinRel;
+using Catch::Matchers::WithinAbs;
 
 TEST_CASE("Transform Mirror") {
   // elementary operations
@@ -440,7 +440,7 @@ TEST_CASE("Barycentric coordinates (prop: Σ = 1)") {
 
   // If all points are on a straight line, the property does not hold
   if (!(x0 == x1 && x1 == x2) && !(y0 == y1 && y1 == y2)) {
-    REQUIRE_THAT(b1 + b2 + b3, WithinRel(1.0, 0.01));
+    REQUIRE_THAT(b1 + b2 + b3, WithinAbs(1.0, 0.01));
   }
 }
 
@@ -580,8 +580,8 @@ TEST_CASE("Star (prop: average of all points is centre)") {
     y += point.second;
   }
 
-  REQUIRE_THAT(x / points.size(), WithinRel(x0, 0.1));
-  REQUIRE_THAT(y / points.size(), WithinRel(y0, 0.1));
+  REQUIRE_THAT(x / points.size(), WithinAbs(x0, 0.5));
+  REQUIRE_THAT(y / points.size(), WithinAbs(y0, 0.5));
 }
 
 // The Haskell implementation of regular_polygon_mod has many more tests,