diff --git a/CMakeLists.txt b/CMakeLists.txt
index 3c58803b0..7448181ae 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -3,7 +3,7 @@ project(POLARSSL C)
 
 enable_testing()
 
-set(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} -g -O0 -Wall -W -fprofile-arcs -ftest-coverage -lgcov")
+set(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} -g -O0 -Wall -W -Wdeclaration-after-statement -fprofile-arcs -ftest-coverage -lgcov")
 set(CMAKE_SHARED_LINKER_FLAGS "-fprofile-arcs -ftest-coverage")
 #set(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} -g -O0 -Wall -W")
 #set(CMAKE_SHARED_LINKER_FLAGS "")