diff --git a/tests/CMakeLists.txt b/tests/CMakeLists.txt
index a54c3de..f079504 100644
--- a/tests/CMakeLists.txt
+++ b/tests/CMakeLists.txt
@@ -1,5 +1,5 @@
 add_custom_target(check
-    COMMAND ctest $(JOBS)
+    COMMAND ctest $(JOBS) --output-on-failure
     )
 
 add_subdirectory(iverilog)