diff --git a/SConstruct b/SConstruct
index 2afb480..d650a8b 100644
--- a/SConstruct
+++ b/SConstruct
@@ -95,7 +95,7 @@ if os.environ.has_key('CC'):
 env.AddMethod(InstallPerm)
 
 env.Append(CFLAGS = ['-std=gnu99','-Wall', '-Wextra', '-Wundef', '-Wcast-qual','-Wshadow' ,'-Wcast-align','-pipe', '-ggdb', '-pthread'])
-env.Append(CFLAGS = ['-Wno-unused-parameter'])
+env.Append(CFLAGS = ['-Wno-unused-parameter', '-Werror=implicit-function-declaration'])
 env.Append(LINKFLAGS = ['-O2', '-pthread'])
 env.Append(CPPDEFINES = ['_FILE_OFFSET_BITS=64'])
 env.Append(CPPPATH = ['#include'])