diff --git a/libupower-glib/meson.build b/libupower-glib/meson.build
index 9a5323c..7eda0be 100644
--- a/libupower-glib/meson.build
+++ b/libupower-glib/meson.build
@@ -51,6 +51,7 @@ libupower_glib = shared_library('upower-glib',
     include_directories: [ '..' ],
     c_args: [
         '-DUP_COMPILATION',
+        '-DG_LOG_DOMAIN="libupower-glib"',
     ],
     soversion: soversion,
     version: libversion,
diff --git a/src/meson.build b/src/meson.build
index 7eb58f1..e9c4d70 100644
--- a/src/meson.build
+++ b/src/meson.build
@@ -43,6 +43,7 @@ upowerd_private = static_library('upowerd-private',
         'up-native.h',
     ],
     dependencies: [ upowerd_deps ],
+    c_args: [ '-DG_LOG_DOMAIN="UPower"' ],
 )
 
 upowerd = executable('upowerd',