diff --git a/SConstruct b/SConstruct
index 5f5b1bbe..cf53b50e 100644
--- a/SConstruct
+++ b/SConstruct
@@ -55,7 +55,7 @@ if env['PLATFORM'] == 'win32':
   env.Append(LIBS = ["rpcrt4", "comctl32", "vfw32", "winmm", "ws2_32", "comdlg32", "ole32", "gdi32", "htmlhelp"])
 else:
   conf = Configure(env)
-  assert conf.CheckLibWithHeader('z', 'zlib.h', 'C', 'inflate;', 1), "please install: zlib"
+  assert conf.CheckLibWithHeader('z', 'zlib.h', 'c', 'inflate;', 1), "please install: zlib"
   if not conf.CheckLib('SDL'):
     print 'Did not find libSDL or SDL.lib, exiting!'
     Exit(1)