diff --git a/editor/libeditor/EditorBase.cpp b/editor/libeditor/EditorBase.cpp
index 6a6f9a452479..1f6f97ddd604 100644
--- a/editor/libeditor/EditorBase.cpp
+++ b/editor/libeditor/EditorBase.cpp
@@ -53,8 +53,8 @@
 #include "mozilla/dom/CharacterData.h"   // for CharacterData
 #include "mozilla/dom/DataTransfer.h"    // for DataTransfer
 #include "mozilla/InternalMutationEvent.h"  // for NS_EVENT_BITS_MUTATION_CHARACTERDATAMODIFIED
-#include "mozilla/dom/Element.h"      // for Element, nsINode::AsElement
-#include "mozilla/dom/EventTarget.h"  // for EventTarget
+#include "mozilla/dom/Element.h"         // for Element, nsINode::AsElement
+#include "mozilla/dom/EventTarget.h"     // for EventTarget
 #include "mozilla/dom/HTMLBodyElement.h"
 #include "mozilla/dom/HTMLBRElement.h"
 #include "mozilla/dom/Selection.h"  // for Selection, etc.
@@ -2396,17 +2396,17 @@ nsresult EditorBase::GetPreferredIMEState(IMEState* aState) {
   NS_ENSURE_TRUE(frame, NS_ERROR_FAILURE);
 
   switch (frame->StyleUIReset()->mIMEMode) {
-    case StyleImeMode::Auto:
+    case NS_STYLE_IME_MODE_AUTO:
       if (IsPasswordEditor()) aState->mEnabled = IMEState::PASSWORD;
       break;
-    case StyleImeMode::Disabled:
+    case NS_STYLE_IME_MODE_DISABLED:
       // we should use password state for |ime-mode: disabled;|.
       aState->mEnabled = IMEState::PASSWORD;
       break;
-    case StyleImeMode::Active:
+    case NS_STYLE_IME_MODE_ACTIVE:
       aState->mOpen = IMEState::OPEN;
       break;
-    case StyleImeMode::Inactive:
+    case NS_STYLE_IME_MODE_INACTIVE:
       aState->mOpen = IMEState::CLOSED;
       break;
   }
diff --git a/layout/style/ServoBindings.toml b/layout/style/ServoBindings.toml
index a1d275027d6f..82812192cbe2 100644
--- a/layout/style/ServoBindings.toml
+++ b/layout/style/ServoBindings.toml
@@ -119,7 +119,6 @@ rusty-enums = [
     "mozilla::StyleRuleInclusion",
     "mozilla::StyleGridTrackBreadth",
     "mozilla::StyleOverscrollBehavior",
-    "mozilla::StyleImeMode",
     "mozilla::StyleOverflowAnchor",
     "mozilla::StyleScrollbarWidth",
     "mozilla::StyleWhiteSpace",
diff --git a/layout/style/nsStyleConsts.h b/layout/style/nsStyleConsts.h
index 4368256099dd..20b2709d322a 100644
--- a/layout/style/nsStyleConsts.h
+++ b/layout/style/nsStyleConsts.h
@@ -722,13 +722,11 @@ enum class StyleWhiteSpace : uint8_t {
 #define NS_STYLE_PAGE_BREAK_RIGHT 4
 
 // See nsStyleUIReset
-enum class StyleImeMode : uint8_t {
-  Auto,
-  Normal,
-  Active,
-  Disabled,
-  Inactive,
-};
+#define NS_STYLE_IME_MODE_AUTO 0
+#define NS_STYLE_IME_MODE_NORMAL 1
+#define NS_STYLE_IME_MODE_ACTIVE 2
+#define NS_STYLE_IME_MODE_DISABLED 3
+#define NS_STYLE_IME_MODE_INACTIVE 4
 
 // See nsStyleSVG
 
diff --git a/layout/style/nsStyleStruct.cpp b/layout/style/nsStyleStruct.cpp
index bef2a64ec71e..166ab9bad9f8 100644
--- a/layout/style/nsStyleStruct.cpp
+++ b/layout/style/nsStyleStruct.cpp
@@ -3703,7 +3703,7 @@ nsStyleUIReset::nsStyleUIReset(const Document& aDocument)
     : mUserSelect(StyleUserSelect::Auto),
       mScrollbarWidth(StyleScrollbarWidth::Auto),
       mForceBrokenImageIcon(0),
-      mIMEMode(StyleImeMode::Auto),
+      mIMEMode(NS_STYLE_IME_MODE_AUTO),
       mWindowDragging(StyleWindowDragging::Default),
       mWindowShadow(NS_STYLE_WINDOW_SHADOW_DEFAULT),
       mWindowOpacity(1.0),
diff --git a/layout/style/nsStyleStruct.h b/layout/style/nsStyleStruct.h
index 5f8a5ca6861d..d79cc1db86b0 100644
--- a/layout/style/nsStyleStruct.h
+++ b/layout/style/nsStyleStruct.h
@@ -2074,7 +2074,7 @@ struct MOZ_NEEDS_MEMMOVABLE_MEMBERS nsStyleUIReset {
   mozilla::StyleUserSelect mUserSelect;  // [reset](selection-style)
   mozilla::StyleScrollbarWidth mScrollbarWidth;
   uint8_t mForceBrokenImageIcon;  // (0 if not forcing, otherwise forcing)
-  mozilla::StyleImeMode mIMEMode;
+  uint8_t mIMEMode;
   mozilla::StyleWindowDragging mWindowDragging;
   uint8_t mWindowShadow;
   float mWindowOpacity;
diff --git a/servo/components/style/properties/longhands/ui.mako.rs b/servo/components/style/properties/longhands/ui.mako.rs
index 9bb38a150c15..647028559677 100644
--- a/servo/components/style/properties/longhands/ui.mako.rs
+++ b/servo/components/style/properties/longhands/ui.mako.rs
@@ -15,7 +15,6 @@ ${helpers.single_keyword(
     "ime-mode",
     "auto normal active disabled inactive",
     engines="gecko",
-    gecko_enum_prefix="StyleImeMode",
     gecko_ffi_name="mIMEMode",
     animation_value_type="discrete",
     spec="https://drafts.csswg.org/css-ui/#input-method-editor",