diff --git a/CMakeLists.txt b/CMakeLists.txt
index bd0367d..f46639a 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -12,6 +12,9 @@
   if (GCC_VERSION VERSION_GREATER 4.5 OR GCC_VERSION VERSION_EQUAL 4.5)
       set(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} -Wlogical-op")
   endif()
+  if (GCC_VERSION VERSION_GREATER 4.8 OR GCC_VERSION VERSION_EQUAL 4.8)
+      set(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} -Wshadow")
+  endif()
   set(CMAKE_C_FLAGS_RELEASE     "-O2")
   set(CMAKE_C_FLAGS_DEBUG       "-O0 -g3")
   set(CMAKE_C_FLAGS_COVERAGE    "-O0 -g3 --coverage")
@@ -22,7 +25,7 @@
 endif(CMAKE_COMPILER_IS_GNUCC)
 
 if(CMAKE_COMPILER_IS_CLANG)
-  set(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} -Wall -Wextra -W -Wdeclaration-after-statement -Wwrite-strings -Wpointer-arith")
+    set(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} -Wall -Wextra -W -Wdeclaration-after-statement -Wwrite-strings -Wpointer-arith -Wshadow")
   set(CMAKE_C_FLAGS_RELEASE     "-O2")
   set(CMAKE_C_FLAGS_DEBUG       "-O0 -g3")
   set(CMAKE_C_FLAGS_COVERAGE    "-O0 -g3 --coverage")