diff --git a/setup/build_environment.py b/setup/build_environment.py
index ae0648ff52..224ea0530f 100644
--- a/setup/build_environment.py
+++ b/setup/build_environment.py
@@ -97,8 +97,8 @@ def get_sip_dir():
 pyqt['pyqt_sip_dir'] = get_sip_dir()
 pyqt['sip_inc_dir'] = os.environ.get('SIP_INC_DIR', sysconfig.get_path('include'))
 
-glib_flags = subprocess.check_output([PKGCONFIG, '--libs', 'glib-2.0']).strip() if islinux or ishaiku else ''
-fontconfig_flags = subprocess.check_output([PKGCONFIG, '--libs', 'fontconfig']).strip() if islinux or ishaiku else ''
+glib_flags = subprocess.check_output([PKGCONFIG, '--libs', 'glib-2.0']).strip() if (islinux or ishaiku) else ''
+fontconfig_flags = subprocess.check_output([PKGCONFIG, '--libs', 'fontconfig']).strip() if (islinux or ishaiku) else ''
 qt_inc = pyqt['inc']
 qt_lib = pyqt['lib']
 ft_lib_dirs = []
@@ -121,7 +121,7 @@ QT_DLLS = ['Qt5' + x for x in (
 'WebKit', 'WebKitWidgets', 'Widgets',  'Multimedia', 'MultimediaWidgets', 'Xml',  # 'XmlPatterns',
 )]
 QT_PLUGINS = ('imageformats', 'audio', 'iconengines', 'mediaservice', 'platforms', 'playlistformats', 'printsupport', 'sqldrivers')
-if islinux or ishaiku:
+if (islinux or ishaiku):
     # platformthemes cause crashes in Ubuntu
     QT_PLUGINS += ('platforminputcontexts', 'generic',)