diff --git a/CMakeLists.txt b/CMakeLists.txt
index c9369c3..3cb6639 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -8,6 +8,7 @@ enable_testing()
 
 function(set_default_target_options target)
   set_property(TARGET ${target} PROPERTY C_STANDARD 11)
+  set_property(TARGET ${target} PROPERTY C_EXTENSIONS OFF)
   target_compile_options(${target} PRIVATE -Wall -Wextra -pedantic)
   if(${SANITIZERS})
 	target_compile_options(${target} PRIVATE -fsanitize=address,undefined)