diff --git a/mozilla/string/public/MANIFEST b/mozilla/string/public/MANIFEST
index cb9a692fd76..8a2a619348e 100644
--- a/mozilla/string/public/MANIFEST
+++ b/mozilla/string/public/MANIFEST
@@ -40,6 +40,7 @@ nsPromiseConcatenation.h
 nsPromiseFlatString.h
 nsPromiseSubstring.h
 nsReadableUtils.h
+nsSharableString.h
 nsSharedBufferList.h
 nsSlidingString.h
 nsStringFragment.h
diff --git a/mozilla/string/public/Makefile.in b/mozilla/string/public/Makefile.in
index 8d13477a3b6..324994585b1 100644
--- a/mozilla/string/public/Makefile.in
+++ b/mozilla/string/public/Makefile.in
@@ -50,6 +50,7 @@ EXPORTS		=				\
 		nsPromiseFlatString.h			\
 		nsPromiseSubstring.h			\
 		nsReadableUtils.h			\
+		nsSharableString.h			\
 		nsSharedBufferList.h			\
 		nsSlidingString.h			\
 		nsStringFragment.h			\
diff --git a/mozilla/string/public/makefile.win b/mozilla/string/public/makefile.win
index 37f2222ac6c..9b1c45d4110 100644
--- a/mozilla/string/public/makefile.win
+++ b/mozilla/string/public/makefile.win
@@ -44,6 +44,7 @@ EXPORTS =                               \
         nsPromiseFlatString.h           \
         nsPromiseSubstring.h            \
         nsReadableUtils.h               \
+        nsSharableString.h              \
         nsSharedBufferList.h            \
         nsSlidingString.h               \
         nsStringFragment.h              \
diff --git a/mozilla/xpcom/string/public/MANIFEST b/mozilla/xpcom/string/public/MANIFEST
index cb9a692fd76..8a2a619348e 100644
--- a/mozilla/xpcom/string/public/MANIFEST
+++ b/mozilla/xpcom/string/public/MANIFEST
@@ -40,6 +40,7 @@ nsPromiseConcatenation.h
 nsPromiseFlatString.h
 nsPromiseSubstring.h
 nsReadableUtils.h
+nsSharableString.h
 nsSharedBufferList.h
 nsSlidingString.h
 nsStringFragment.h
diff --git a/mozilla/xpcom/string/public/Makefile.in b/mozilla/xpcom/string/public/Makefile.in
index 8d13477a3b6..324994585b1 100644
--- a/mozilla/xpcom/string/public/Makefile.in
+++ b/mozilla/xpcom/string/public/Makefile.in
@@ -50,6 +50,7 @@ EXPORTS		=				\
 		nsPromiseFlatString.h			\
 		nsPromiseSubstring.h			\
 		nsReadableUtils.h			\
+		nsSharableString.h			\
 		nsSharedBufferList.h			\
 		nsSlidingString.h			\
 		nsStringFragment.h			\
diff --git a/mozilla/xpcom/string/public/makefile.win b/mozilla/xpcom/string/public/makefile.win
index 37f2222ac6c..9b1c45d4110 100644
--- a/mozilla/xpcom/string/public/makefile.win
+++ b/mozilla/xpcom/string/public/makefile.win
@@ -44,6 +44,7 @@ EXPORTS =                               \
         nsPromiseFlatString.h           \
         nsPromiseSubstring.h            \
         nsReadableUtils.h               \
+        nsSharableString.h              \
         nsSharedBufferList.h            \
         nsSlidingString.h               \
         nsStringFragment.h              \