diff --git a/packages/react-reconciler/src/ReactFiberWorkLoop.new.js b/packages/react-reconciler/src/ReactFiberWorkLoop.new.js
index f2120c2d6920e..376a7c9670a4e 100644
--- a/packages/react-reconciler/src/ReactFiberWorkLoop.new.js
+++ b/packages/react-reconciler/src/ReactFiberWorkLoop.new.js
@@ -116,7 +116,7 @@ import {
   Snapshot,
   Callback,
   Passive,
-  PassiveUnmountPending,
+  PassiveUnmountPendingDev,
   Incomplete,
   HostEffectMask,
   Hydrating,
@@ -2313,10 +2313,10 @@ export function enqueuePendingPassiveHookEffectUnmount(
     pendingPassiveHookEffectsUnmount.push(effect, fiber);
     if (__DEV__) {
       if (deferPassiveEffectCleanupDuringUnmount) {
-        fiber.effectTag |= PassiveUnmountPending;
+        fiber.effectTag |= PassiveUnmountPendingDev;
         const alternate = fiber.alternate;
         if (alternate !== null) {
-          alternate.effectTag |= PassiveUnmountPending;
+          alternate.effectTag |= PassiveUnmountPendingDev;
         }
       }
     }
@@ -2385,10 +2385,10 @@ function flushPassiveEffectsImpl() {
 
       if (__DEV__) {
         if (deferPassiveEffectCleanupDuringUnmount) {
-          fiber.effectTag &= ~PassiveUnmountPending;
+          fiber.effectTag &= ~PassiveUnmountPendingDev;
           const alternate = fiber.alternate;
           if (alternate !== null) {
-            alternate.effectTag &= ~PassiveUnmountPending;
+            alternate.effectTag &= ~PassiveUnmountPendingDev;
           }
         }
       }
@@ -2872,7 +2872,7 @@ function warnAboutUpdateOnUnmountedFiberInDEV(fiber) {
     ) {
       // If there are pending passive effects unmounts for this Fiber,
       // we can assume that they would have prevented this update.
-      if ((fiber.effectTag & PassiveUnmountPending) !== NoEffect) {
+      if ((fiber.effectTag & PassiveUnmountPendingDev) !== NoEffect) {
         return;
       }
     }
diff --git a/packages/react-reconciler/src/ReactFiberWorkLoop.old.js b/packages/react-reconciler/src/ReactFiberWorkLoop.old.js
index 5c018c6bb926c..713bcc23f85f2 100644
--- a/packages/react-reconciler/src/ReactFiberWorkLoop.old.js
+++ b/packages/react-reconciler/src/ReactFiberWorkLoop.old.js
@@ -116,7 +116,7 @@ import {
   Snapshot,
   Callback,
   Passive,
-  PassiveUnmountPending,
+  PassiveUnmountPendingDev,
   Incomplete,
   HostEffectMask,
   Hydrating,
@@ -2332,10 +2332,10 @@ export function enqueuePendingPassiveHookEffectUnmount(
     pendingPassiveHookEffectsUnmount.push(effect, fiber);
     if (__DEV__) {
       if (deferPassiveEffectCleanupDuringUnmount) {
-        fiber.effectTag |= PassiveUnmountPending;
+        fiber.effectTag |= PassiveUnmountPendingDev;
         const alternate = fiber.alternate;
         if (alternate !== null) {
-          alternate.effectTag |= PassiveUnmountPending;
+          alternate.effectTag |= PassiveUnmountPendingDev;
         }
       }
     }
@@ -2404,10 +2404,10 @@ function flushPassiveEffectsImpl() {
 
       if (__DEV__) {
         if (deferPassiveEffectCleanupDuringUnmount) {
-          fiber.effectTag &= ~PassiveUnmountPending;
+          fiber.effectTag &= ~PassiveUnmountPendingDev;
           const alternate = fiber.alternate;
           if (alternate !== null) {
-            alternate.effectTag &= ~PassiveUnmountPending;
+            alternate.effectTag &= ~PassiveUnmountPendingDev;
           }
         }
       }
@@ -2894,7 +2894,7 @@ function warnAboutUpdateOnUnmountedFiberInDEV(fiber) {
     ) {
       // If there are pending passive effects unmounts for this Fiber,
       // we can assume that they would have prevented this update.
-      if ((fiber.effectTag & PassiveUnmountPending) !== NoEffect) {
+      if ((fiber.effectTag & PassiveUnmountPendingDev) !== NoEffect) {
         return;
       }
     }
diff --git a/packages/react-reconciler/src/ReactSideEffectTags.js b/packages/react-reconciler/src/ReactSideEffectTags.js
index e493a0fb883bf..162b860c19eb3 100644
--- a/packages/react-reconciler/src/ReactSideEffectTags.js
+++ b/packages/react-reconciler/src/ReactSideEffectTags.js
@@ -10,29 +10,29 @@
 export type SideEffectTag = number;
 
 // Don't change these two values. They're used by React Dev Tools.
-export const NoEffect = /*              */ 0b00000000000000;
-export const PerformedWork = /*         */ 0b00000000000001;
+export const NoEffect = /*                 */ 0b00000000000000;
+export const PerformedWork = /*            */ 0b00000000000001;
 
 // You can change the rest (and add more).
-export const Placement = /*             */ 0b00000000000010;
-export const Update = /*                */ 0b00000000000100;
-export const PlacementAndUpdate = /*    */ 0b00000000000110;
-export const Deletion = /*              */ 0b00000000001000;
-export const ContentReset = /*          */ 0b00000000010000;
-export const Callback = /*              */ 0b00000000100000;
-export const DidCapture = /*            */ 0b00000001000000;
-export const Ref = /*                   */ 0b00000010000000;
-export const Snapshot = /*              */ 0b00000100000000;
-export const Passive = /*               */ 0b00001000000000;
-export const PassiveUnmountPending = /* */ 0b10000000000000;
-export const Hydrating = /*             */ 0b00010000000000;
-export const HydratingAndUpdate = /*    */ 0b00010000000100;
+export const Placement = /*                */ 0b00000000000010;
+export const Update = /*                   */ 0b00000000000100;
+export const PlacementAndUpdate = /*       */ 0b00000000000110;
+export const Deletion = /*                 */ 0b00000000001000;
+export const ContentReset = /*             */ 0b00000000010000;
+export const Callback = /*                 */ 0b00000000100000;
+export const DidCapture = /*               */ 0b00000001000000;
+export const Ref = /*                      */ 0b00000010000000;
+export const Snapshot = /*                 */ 0b00000100000000;
+export const Passive = /*                  */ 0b00001000000000;
+export const PassiveUnmountPendingDev = /* */ 0b10000000000000;
+export const Hydrating = /*                */ 0b00010000000000;
+export const HydratingAndUpdate = /*       */ 0b00010000000100;
 
 // Passive & Update & Callback & Ref & Snapshot
-export const LifecycleEffectMask = /*   */ 0b00001110100100;
+export const LifecycleEffectMask = /*      */ 0b00001110100100;
 
 // Union of all host effects
-export const HostEffectMask = /*        */ 0b00011111111111;
+export const HostEffectMask = /*           */ 0b00011111111111;
 
-export const Incomplete = /*            */ 0b00100000000000;
-export const ShouldCapture = /*         */ 0b01000000000000;
+export const Incomplete = /*               */ 0b00100000000000;
+export const ShouldCapture = /*            */ 0b01000000000000;