diff --git a/BUILD.md b/BUILD.md
index 585b088c..878864da 100644
--- a/BUILD.md
+++ b/BUILD.md
@@ -65,6 +65,8 @@ cmake -DCMAKE_INSTALL_PREFIX=../install ../src
 make -j8 install
 ```
 
+**NOTE:** If you want to treat all warnings as errors add -DCMAKE_BUILD_TYPE=Debug to the above cmake command
+
 You can use IDEs like KDevelop or QtCreator to open the CMake project if you want to work on the code.
 
 ### Installing Qt using the installer (optional)
diff --git a/CMakeLists.txt b/CMakeLists.txt
index fc1e1eb4..ddc0956e 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -55,12 +55,12 @@ set(CMAKE_C_STANDARD_REQUIRED true)
 set(CMAKE_CXX_STANDARD 11)
 set(CMAKE_C_STANDARD 11)
 include(GenerateExportHeader)
-set(CMAKE_CXX_FLAGS " -Wall -pedantic -Werror -Wno-deprecated-declarations -D_GLIBCXX_USE_CXX11_ABI=0 -fstack-protector-strong --param=ssp-buffer-size=4 ${CMAKE_CXX_FLAGS}")
+set(CMAKE_CXX_FLAGS " -Wall -pedantic -Wno-deprecated-declarations -D_GLIBCXX_USE_CXX11_ABI=0 -fstack-protector-strong --param=ssp-buffer-size=4 ${CMAKE_CXX_FLAGS}")
 set(CMAKE_CXX_FLAGS_RELEASE " -O3 -D_FORTIFY_SOURCE=2 ${CMAKE_CXX_FLAGS_RELEASE}")
 if(UNIX AND APPLE)
     set(CMAKE_CXX_FLAGS " -stdlib=libc++ ${CMAKE_CXX_FLAGS}")
 endif()
-set(CMAKE_CXX_FLAGS_DEBUG "${CMAKE_CXX_FLAGS_DEBUG} -Werror=return-type -O0")
+set(CMAKE_CXX_FLAGS_DEBUG "${CMAKE_CXX_FLAGS_DEBUG} -Werror -Werror=return-type -O0")
 
 # Fix build with Qt 5.13
 set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -DQT_NO_DEPRECATED_WARNINGS=Y")