diff --git a/Source/gio/generated/generate_code.py b/Source/gio/generated/generate_code.py
index 12168fe8c..3c36254da 100644
--- a/Source/gio/generated/generate_code.py
+++ b/Source/gio/generated/generate_code.py
@@ -37,12 +37,17 @@ if __name__ == "__main__":
 
     shutil.copyfile(opts.api_raw, api_xml)
 
+    if shutil.which('mono'):
+        launcher = ['mono']
+    else:
+        launcher = []
+
     cmd = [opts.gapi_fixup, "--api=" + api_xml]
     if opts.metadata:
         cmd += ["--metadata=" + opts.metadata]
     if opts.symbols:
         cmd.extend(['--symbols=' + opts.symbols])
-    subprocess.check_call(cmd)
+    subprocess.check_call(launcher + cmd)
 
     cmd = [
         opts.gapi_codegen, '--generate', api_xml,
@@ -57,8 +62,7 @@ if __name__ == "__main__":
 
     cmd += ['-I' + i for i in opts.extra_includes]
 
-    print(' '.join(cmd))
-    subprocess.check_call(cmd)
+    subprocess.check_call(launcher + cmd)
 
     # WORKAROUND: Moving files into the out directory with special names
     # as meson doesn't like path separator in output names.
diff --git a/Source/meson.build b/Source/meson.build
index 744de3f6e..b33b3b867 100644
--- a/Source/meson.build
+++ b/Source/meson.build
@@ -30,7 +30,7 @@ if csc.get_id() == 'mono'
     endif
 
     add_project_arguments('-keyfile:' + join_paths(meson.current_source_dir(), 'gtk-sharp.snk'),
-        languages: ['cs'])
+        language: ['cs'])
 endif
 
 install = get_option('install')