diff --git a/sample/CMakeLists.txt b/sample/CMakeLists.txt
index 4f6fe11..33d9606 100644
--- a/sample/CMakeLists.txt
+++ b/sample/CMakeLists.txt
@@ -1,4 +1,5 @@
-
 set(CMAKE_CXX_STANDARD 11)
 
+set(CMAKE_BUILD_TYPE Debug)
+
 add_executable(sample sample.cpp ../tests/ArffFiles.cpp ../Metrics.cpp ../CPPFImdlp.cpp)