diff --git a/layout/mathml/base/src/Makefile.in b/layout/mathml/base/src/Makefile.in
index b01e94bbfafd..6d806327912b 100644
--- a/layout/mathml/base/src/Makefile.in
+++ b/layout/mathml/base/src/Makefile.in
@@ -58,6 +58,7 @@ CPPSRCS =         nsMathMLChar.cpp		        \
                   nsMathMLmunderoverFrame.cpp		\
                   nsMathMLmpaddedFrame.cpp		\
                   nsMathMLmspaceFrame.cpp		\
+                  nsMathMLmsFrame.cpp			\
                   nsMathMLmstyleFrame.cpp		\
                   nsMathMLmsqrtFrame.cpp		\
                   nsMathMLmrootFrame.cpp		\
diff --git a/layout/mathml/base/src/makefile.win b/layout/mathml/base/src/makefile.win
index f280c5fda6f7..77c3ffe84a43 100644
--- a/layout/mathml/base/src/makefile.win
+++ b/layout/mathml/base/src/makefile.win
@@ -47,6 +47,7 @@ CPPSRCS=          nsMathMLChar.cpp                      \
                   nsMathMLmunderoverFrame.cpp		\
                   nsMathMLmpaddedFrame.cpp		\
                   nsMathMLmspaceFrame.cpp		\
+                  nsMathMLmsFrame.cpp			\
                   nsMathMLmstyleFrame.cpp		\
                   nsMathMLmsqrtFrame.cpp		\
                   nsMathMLmrootFrame.cpp		\
@@ -71,6 +72,7 @@ CPP_OBJS= .\$(OBJDIR)\nsMathMLChar.obj		        \
           .\$(OBJDIR)\nsMathMLmunderoverFrame.obj	\
           .\$(OBJDIR)\nsMathMLmpaddedFrame.obj		\
           .\$(OBJDIR)\nsMathMLmspaceFrame.obj		\
+          .\$(OBJDIR)\nsMathMLmsFrame.obj		\
           .\$(OBJDIR)\nsMathMLmstyleFrame.obj		\
           .\$(OBJDIR)\nsMathMLmsqrtFrame.obj		\
           .\$(OBJDIR)\nsMathMLmrootFrame.obj		\
diff --git a/layout/mathml/base/src/nsMathMLParts.h b/layout/mathml/base/src/nsMathMLParts.h
index b0602adb0663..7886f6fcdbd2 100644
--- a/layout/mathml/base/src/nsMathMLParts.h
+++ b/layout/mathml/base/src/nsMathMLParts.h
@@ -33,6 +33,7 @@ extern nsresult NS_NewMathMLmoFrame ( nsIPresShell* aPresShell, nsIFrame** aNewF
 extern nsresult NS_NewMathMLmphantomFrame ( nsIPresShell* aPresShell, nsIFrame** aNewFrame );
 extern nsresult NS_NewMathMLmpaddedFrame ( nsIPresShell* aPresShell, nsIFrame** aNewFrame );
 extern nsresult NS_NewMathMLmspaceFrame ( nsIPresShell* aPresShell, nsIFrame** aNewFrame );
+extern nsresult NS_NewMathMLmsFrame ( nsIPresShell* aPresShell, nsIFrame** aNewFrame );
 extern nsresult NS_NewMathMLmfencedFrame ( nsIPresShell* aPresShell, nsIFrame** aNewFrame );
 extern nsresult NS_NewMathMLmfracFrame ( nsIPresShell* aPresShell, nsIFrame** aNewFrame );
 extern nsresult NS_NewMathMLmsubFrame ( nsIPresShell* aPresShell, nsIFrame** aNewFrame );
diff --git a/layout/mathml/base/src/nsMathMLmiFrame.cpp b/layout/mathml/base/src/nsMathMLmiFrame.cpp
index 1b11e1f2f2a7..e17281f5b11f 100644
--- a/layout/mathml/base/src/nsMathMLmiFrame.cpp
+++ b/layout/mathml/base/src/nsMathMLmiFrame.cpp
@@ -38,7 +38,6 @@
 #include "nsStyleUtil.h"
 
 #include "nsIDOMText.h"
-#include "nsITextContent.h"
 
 #include "nsMathMLmiFrame.h"