diff --git a/mesonbuild/interpreterbase.py b/mesonbuild/interpreterbase.py
index 91f4bd3e9..9dc6b0f95 100644
--- a/mesonbuild/interpreterbase.py
+++ b/mesonbuild/interpreterbase.py
@@ -18,7 +18,7 @@
 from . import mparser, mesonlib, mlog
 from . import environment, dependencies
 
-import os, copy, re
+import os, copy, re, types
 from functools import wraps
 
 # Decorators for method calls.
@@ -63,17 +63,19 @@ class permittedKwargs:
     def __call__(self, f):
         @wraps(f)
         def wrapped(s, node_or_state, args, kwargs):
+            loc = types.SimpleNamespace()
             if hasattr(s, 'subdir'):
-                subdir = s.subdir
-                lineno = s.current_lineno
+                loc.subdir = s.subdir
+                loc.lineno = s.current_lineno
             elif hasattr(node_or_state, 'subdir'):
-                subdir = node_or_state.subdir
-                lineno = node_or_state.current_lineno
+                loc.subdir = node_or_state.subdir
+                loc.lineno = node_or_state.current_lineno
+            else:
+                loc = None
             for k in kwargs:
                 if k not in self.permitted:
-                    fname = os.path.join(subdir, environment.build_filename)
-                    mlog.warning('''Passed invalid keyword argument "%s" in %s line %d.
-This will become a hard error in the future.''' % (k, fname, lineno))
+                    mlog.warning('''Passed invalid keyword argument "{}"'''.format(k), location=loc)
+                    mlog.warning('This will become a hard error in the future.')
             return f(s, node_or_state, args, kwargs)
         return wrapped
 
diff --git a/run_unittests.py b/run_unittests.py
index 11f16a24d..c634b8b2b 100755
--- a/run_unittests.py
+++ b/run_unittests.py
@@ -1717,6 +1717,7 @@ int main(int argc, char **argv) {
             r'WARNING: subdir warning in file sub' + os.path.sep + r'meson.build, line 4',
             r'WARNING: Module unstable-simd has no backwards or forwards compatibility and might not exist in future releases in file meson.build, line 7',
             r"WARNING: The variable(s) 'MISSING' in the input file conf.in are not present in the given configuration data in file meson.build, line 10",
+            r'WARNING: Passed invalid keyword argument "invalid" in file meson.build, line 1'
         ]:
             self.assertRegex(out, re.escape(expected))
 
diff --git a/test cases/unit/20 warning location/meson.build b/test cases/unit/20 warning location/meson.build
index 0b14b8be9..15295a95c 100644
--- a/test cases/unit/20 warning location/meson.build	
+++ b/test cases/unit/20 warning location/meson.build	
@@ -1,4 +1,4 @@
-project('warning location', 'c')
+project('warning location', 'c', invalid: 'cheese')
 a = library('liba', 'a.c')
 b = library('libb', 'b.c')
 executable('main', 'main.c', link_with: a, link_with: b)