diff --git a/src/hallelujah.cpp b/src/hallelujah.cpp
index aac78cf..adcd873 100644
--- a/src/hallelujah.cpp
+++ b/src/hallelujah.cpp
@@ -103,16 +103,17 @@ void HallelujahState::updatePreedit(InputContext *ic) {
         preedit.setCursor(buffer_.cursor());
     }
 
-    PreeditMode mode = ic->capabilityFlags().test(CapabilityFlag::Preedit)
-                           ? *engine_->config().preeditMode
-                           : PreeditMode::No;
+    hallelujah::PreeditMode mode =
+        ic->capabilityFlags().test(CapabilityFlag::Preedit)
+            ? *engine_->config().preeditMode
+            : hallelujah::PreeditMode::No;
     auto &inputPanel = ic->inputPanel();
     switch (mode) {
-    case PreeditMode::No:
+    case hallelujah::PreeditMode::No:
         inputPanel.setPreedit(preedit);
         inputPanel.setClientPreedit(Text());
         break;
-    case PreeditMode::ComposingText:
+    case hallelujah::PreeditMode::ComposingText:
         inputPanel.setClientPreedit(preedit);
         break;
     }
diff --git a/src/hallelujah.h b/src/hallelujah.h
index 0ab0c36..2dcee57 100644
--- a/src/hallelujah.h
+++ b/src/hallelujah.h
@@ -14,20 +14,24 @@
 #include <unordered_map>
 
 namespace fcitx {
+namespace hallelujah {
 enum class PreeditMode { No, ComposingText };
 
 FCITX_CONFIG_ENUM_NAME_WITH_I18N(PreeditMode, N_("Do not show"),
                                  N_("Composing text"))
+} // namespace hallelujah
 
-FCITX_CONFIGURATION(
-    HallelujahEngineConfig,
-    OptionWithAnnotation<PreeditMode, PreeditModeI18NAnnotation> preeditMode{
-        this, "PreeditMode", _("Preedit Mode"), PreeditMode::ComposingText};
-    Option<bool> showIPA{this, "ShowIPA", _("Show IPA"), true};
-    Option<bool> showTranslation{this, "ShowTranslation", _("Show translation"),
-                                 true};
-    Option<bool> commitWithSpace{this, "CommitWithSpace",
-                                 _("Commit with space"), false};);
+FCITX_CONFIGURATION(HallelujahEngineConfig,
+                    OptionWithAnnotation<hallelujah::PreeditMode,
+                                         hallelujah::PreeditModeI18NAnnotation>
+                        preeditMode{this, "PreeditMode", _("Preedit Mode"),
+                                    hallelujah::PreeditMode::ComposingText};
+                    Option<bool> showIPA{this, "ShowIPA", _("Show IPA"), true};
+                    Option<bool> showTranslation{this, "ShowTranslation",
+                                                 _("Show translation"), true};
+                    Option<bool> commitWithSpace{this, "CommitWithSpace",
+                                                 _("Commit with space"),
+                                                 false};);
 
 struct HallelujahWord {
     HallelujahWord(const std::vector<std::string> &translation,