diff --git a/.travis.yml b/.travis.yml
index 116b13e..4bf2146 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -26,7 +26,7 @@ matrix:
         - ulimit -c unlimited -S
       script:
         - mkdir build_dir && cd build_dir
-        - cmake -DLUA_INCLUDE_DIR="/usr/include/lua5.2" -DLUA_LIBRARY="/usr/lib/x86_64-linux-gnu/liblua5.2.so" ..
+        - cmake -DCMAKE_BUILD_TYPE=Debug -DLUA_INCLUDE_DIR="/usr/include/lua5.2" -DLUA_LIBRARY="/usr/lib/x86_64-linux-gnu/liblua5.2.so" ..
         - make -j4 all && make install
         - ./tests
         - ./run_tests.lua
@@ -40,6 +40,6 @@ matrix:
         - brew install lua
       script:
         - mkdir build_dir && cd build_dir
-        - cmake .. && make -j4 all && make install
+        - cmake -DCMAKE_BUILD_TYPE=Debug .. && make -j4 all && make install
         - ./tests
         - ./run_tests.lua
diff --git a/CMakeLists.txt b/CMakeLists.txt
index 83867a2..78b8dbc 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -21,10 +21,11 @@ endif()
 add_library(effil SHARED ${SOURCES})
 target_link_libraries(effil -lpthread ${LUA_LIBRARY})
 
-set(GENERAL "-std=c++14 -pthread")
-set(ENABLE_WARNINGS "-Wall -Wextra -pedantic -Werror")
-set(BUILD_FLAVOR "-O3 -DNDEBUG")
-set_target_properties(effil PROPERTIES COMPILE_FLAGS "${ENABLE_WARNINGS} ${GENERAL} ${BUILD_FLAVOR}")
+set(GENERAL "-std=c++14")
+set(ENABLE_WARNINGS "-Wall -Wextra -pedantic")
+set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} ${GENERAL} ${ENABLE_WARNINGS}")
+set(CMAKE_CXX_FLAGS_DEBUG "${CMAKE_CXX_FLAGS_DEBUG} -Werror -O0 -g -UNDEBUG")
+set(CMAKE_CXX_FLAGS_RELEASE "${CMAKE_CXX_FLAGS_RELEASE} -O3 -g0 -DNDEBUG")
 
 #----------
 # TESTS ---
@@ -38,8 +39,6 @@ include_directories(${GTEST_DIR}/include ${GTEST_DIR})
 add_executable(tests ${TEST_SOURCES} ${GTEST_DIR}/src/gtest-all.cc)
 target_link_libraries(tests effil)
 
-set_target_properties(tests PROPERTIES COMPILE_FLAGS "${ENABLE_WARNINGS} ${GENERAL} ${BUILD_FLAVOR}")
-
 #----------
 # INSTALL -
 #----------