diff --git a/plugins/perl/meson.build b/plugins/perl/meson.build
index a2d215ef..aa7a16af 100644
--- a/plugins/perl/meson.build
+++ b/plugins/perl/meson.build
@@ -79,7 +79,7 @@ perl_cflags += ['-Wno-strict-prototypes']
 perl_cflags += [
   # Perl has its own 'config.h' that we must override
   # TODO: Just rename ours to something more unique.
-  '-include', meson.build_root() + '/config.h'
+  '-include', meson.project_build_root() + '/config.h'
 ]
 
 if not cc.links('''
diff --git a/src/fe-gtk/meson.build b/src/fe-gtk/meson.build
index 699d0ccc..fa8c2c6c 100644
--- a/src/fe-gtk/meson.build
+++ b/src/fe-gtk/meson.build
@@ -167,7 +167,7 @@ emoji_ui_tests = executable('emoji_ui_tests',
   dependencies: emoji_font_deps,
 )
 test('Emoji UI Tests', emoji_ui_tests,
-  env: ['ZOITECHAT_EMOJI_FONT=' + join_paths(meson.source_root(), 'data/fonts/NotoColorEmoji.ttf')],
+  env: ['ZOITECHAT_EMOJI_FONT=' + join_paths(meson.project_source_root(), 'data/fonts/NotoColorEmoji.ttf')],
   protocol: 'tap',
   timeout: 120,
 )
@@ -291,7 +291,7 @@ emoji_font_tests = executable('emoji_font_tests',
   dependencies: emoji_font_deps,
 )
 test('Emoji Font Tests', emoji_font_tests,
-  env: ['ZOITECHAT_EMOJI_FONT=' + join_paths(meson.source_root(), 'data/fonts/NotoColorEmoji.ttf')],
+  env: ['ZOITECHAT_EMOJI_FONT=' + join_paths(meson.project_source_root(), 'data/fonts/NotoColorEmoji.ttf')],
   protocol: 'tap',
   timeout: 120,
 )