diff --git a/src/spice2x/CMakeLists.txt b/src/spice2x/CMakeLists.txt
index d11a230..fa9aa2b 100644
--- a/src/spice2x/CMakeLists.txt
+++ b/src/spice2x/CMakeLists.txt
@@ -118,6 +118,9 @@ elseif(CMAKE_CXX_COMPILER_ID STREQUAL "Clang")
     set(CMAKE_SHARED_LINKER_FLAGS "${CMAKE_SHARED_LINKER_FLAGS} -static")
 else()
 
+    # warnings as errors
+    set(CMAKE_COMPILE_WARNING_AS_ERROR ON)
+
     # warnings
     set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -Wall -Wextra") # enable stuff
     set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -Wno-pointer-arith") # but we love pointer arithmetic :)