diff --git a/interpreter.py b/interpreter.py
index 167e4288c..1d6a1323a 100644
--- a/interpreter.py
+++ b/interpreter.py
@@ -1136,6 +1136,7 @@ class Interpreter():
         mlog.debug('Adding test "', mlog.bold(args[0]), '".', sep='')
 
     def func_headers(self, node, args, kwargs):
+        args = self.flatten(args)
         for a in args:
             if not isinstance(a, str):
                 raise InvalidArguments('Argument %s is not a string.' % str(a))
diff --git a/test cases/common/9 header install/meson.build b/test cases/common/9 header install/meson.build
index 6e54489a3..b5388ae57 100644
--- a/test cases/common/9 header install/meson.build	
+++ b/test cases/common/9 header install/meson.build	
@@ -1,4 +1,6 @@
 project('header install', 'c')
 
+as_array = ['subdir.h']
+
 h1 = headers('rootdir.h')
-h2 = headers('subdir.h', subdir : 'subdir')
+h2 = headers(as_array, subdir : 'subdir')