diff --git a/tests/unit_tests/checkpoints.cpp b/tests/unit_tests/checkpoints.cpp
index cb490023..b1d251d2 100644
--- a/tests/unit_tests/checkpoints.cpp
+++ b/tests/unit_tests/checkpoints.cpp
@@ -49,7 +49,7 @@ TEST(checkpoints_is_alternative_block_allowed, handles_empty_checkpoints)
 TEST(checkpoints_is_alternative_block_allowed, handles_one_checkpoint)
 {
   checkpoints cp;
-  cp.add_checkpoint(5, "0000000000000000000000000000000000000000000000000000000000000000");
+  ASSERT_TRUE(cp.add_checkpoint(5, "0000000000000000000000000000000000000000000000000000000000000000"));
 
   ASSERT_FALSE(cp.is_alternative_block_allowed(0, 0));
 
@@ -87,8 +87,8 @@ TEST(checkpoints_is_alternative_block_allowed, handles_one_checkpoint)
 TEST(checkpoints_is_alternative_block_allowed, handles_two_and_more_checkpoints)
 {
   checkpoints cp;
-  cp.add_checkpoint(5, "0000000000000000000000000000000000000000000000000000000000000000");
-  cp.add_checkpoint(9, "0000000000000000000000000000000000000000000000000000000000000000");
+  ASSERT_TRUE(cp.add_checkpoint(5, "0000000000000000000000000000000000000000000000000000000000000000"));
+  ASSERT_TRUE(cp.add_checkpoint(9, "0000000000000000000000000000000000000000000000000000000000000000"));
 
   ASSERT_FALSE(cp.is_alternative_block_allowed(0, 0));