diff --git a/mozilla/string/macbuild/string.mcp b/mozilla/string/macbuild/string.mcp
index 4c5de2c6d35..51282fd46ba 100644
Binary files a/mozilla/string/macbuild/string.mcp and b/mozilla/string/macbuild/string.mcp differ
diff --git a/mozilla/string/src/Makefile.in b/mozilla/string/src/Makefile.in
index 8ca522cde25..578c9aa57a0 100644
--- a/mozilla/string/src/Makefile.in
+++ b/mozilla/string/src/Makefile.in
@@ -45,6 +45,7 @@ CPPSRCS		=				\
 		nsPromiseFlatString.cpp		\
 		nsPromiseSubstring.cpp		\
 		nsReadableUtils.cpp		\
+		nsSharableString.cpp		\
 		nsSharedBufferList.cpp		\
 		nsSlidingString.cpp		\
 		$(NULL)
diff --git a/mozilla/string/src/makefile.win b/mozilla/string/src/makefile.win
index 608ec516b6a..222ab2788d7 100644
--- a/mozilla/string/src/makefile.win
+++ b/mozilla/string/src/makefile.win
@@ -40,6 +40,7 @@ CPP_OBJS =                                      \
         .\$(OBJDIR)\nsPromiseFlatString.obj     \
         .\$(OBJDIR)\nsPromiseSubstring.obj      \
         .\$(OBJDIR)\nsReadableUtils.obj         \
+        .\$(OBJDIR)\nsSharableString.obj        \
         .\$(OBJDIR)\nsSharedBufferList.obj      \
         .\$(OBJDIR)\nsSlidingString.obj         \
         $(NULL)
diff --git a/mozilla/xpcom/string/macbuild/string.mcp b/mozilla/xpcom/string/macbuild/string.mcp
index 4c5de2c6d35..51282fd46ba 100644
Binary files a/mozilla/xpcom/string/macbuild/string.mcp and b/mozilla/xpcom/string/macbuild/string.mcp differ
diff --git a/mozilla/xpcom/string/src/Makefile.in b/mozilla/xpcom/string/src/Makefile.in
index 8ca522cde25..578c9aa57a0 100644
--- a/mozilla/xpcom/string/src/Makefile.in
+++ b/mozilla/xpcom/string/src/Makefile.in
@@ -45,6 +45,7 @@ CPPSRCS		=				\
 		nsPromiseFlatString.cpp		\
 		nsPromiseSubstring.cpp		\
 		nsReadableUtils.cpp		\
+		nsSharableString.cpp		\
 		nsSharedBufferList.cpp		\
 		nsSlidingString.cpp		\
 		$(NULL)
diff --git a/mozilla/xpcom/string/src/makefile.win b/mozilla/xpcom/string/src/makefile.win
index 608ec516b6a..222ab2788d7 100644
--- a/mozilla/xpcom/string/src/makefile.win
+++ b/mozilla/xpcom/string/src/makefile.win
@@ -40,6 +40,7 @@ CPP_OBJS =                                      \
         .\$(OBJDIR)\nsPromiseFlatString.obj     \
         .\$(OBJDIR)\nsPromiseSubstring.obj      \
         .\$(OBJDIR)\nsReadableUtils.obj         \
+        .\$(OBJDIR)\nsSharableString.obj        \
         .\$(OBJDIR)\nsSharedBufferList.obj      \
         .\$(OBJDIR)\nsSlidingString.obj         \
         $(NULL)