diff --git a/tests/filter_cflags/wscript b/tests/filter_cflags/wscript
index 09ca151..014d356 100644
--- a/tests/filter_cflags/wscript
+++ b/tests/filter_cflags/wscript
@@ -9,7 +9,7 @@ def configure(conf):
 	conf.load('compiler_c compiler_cxx')
 
 	c_only_flags = [
-		'-DSOME_DEFINITION', # let's guess this flag always exist
+		'-Wall', # let's guess this flag always exist
 		'-Wsomething-that-does-not-exist'
 	]
 
@@ -17,7 +17,12 @@ def configure(conf):
 		'-std=c++11', # let's guess this flag always exist only for C++ compiler
 	]
 
-	if '-Wsomething-that-does-not-exist' in conf.filter_cflags(c_only_flags):
+	filtered_cflags = conf.filter_cflags(c_only_flags)
+
+	if '-Wall' not in filtered_cflags:
+		conf.fatal('TEST FAILED')
+
+	if '-Wsomething-that-does-not-exist' in filtered_cflags:
 		conf.fatal('TEST FAILED')
 
 	if '-std=c++11' in conf.filter_cflags(cxx_only_flags):