diff --git a/mozilla/config/autoconf.mk.in b/mozilla/config/autoconf.mk.in
index 118e206e479..8165ef606ad 100644
--- a/mozilla/config/autoconf.mk.in
+++ b/mozilla/config/autoconf.mk.in
@@ -381,8 +381,6 @@ MOZ_AUTO_DEPS	= @MOZ_AUTO_DEPS@
 COMPILER_DEPEND = @COMPILER_DEPEND@
 MDDEPDIR        := @MDDEPDIR@
 
-MOZ_DISABLE_DTD_DEBUG = @MOZ_DISABLE_DTD_DEBUG@
-
 MOZ_DEMANGLE_SYMBOLS = @MOZ_DEMANGLE_SYMBOLS@
 
 # XXX - these need to be cleaned up and have real checks added -cls
diff --git a/mozilla/configure.in b/mozilla/configure.in
index 99e18deec48..ca254613928 100644
--- a/mozilla/configure.in
+++ b/mozilla/configure.in
@@ -3837,20 +3837,6 @@ MOZ_ARG_ENABLE_STRING(debugger-info-modules,
       MOZ_DBGRINFO_MODULES="$i $MOZ_DBGRINFO_MODULES";
     done ])
 
-dnl ========================================================
-dnl = Disable some DTD debugging code in the parser that 
-dnl = breaks on some compilers because of evil and broken 
-dnl = streams code in htmlparser/src/prstrm.cpp
-dnl ========================================================
-MOZ_DISABLE_DTD_DEBUG=
-MOZ_ARG_DISABLE_BOOL(dtd-debug,
-[  --disable-dtd-debug     Disable DTD debugging code in the parser],
-    MOZ_DISABLE_DTD_DEBUG=1,
-    MOZ_DISABLE_DTD_DEBUG= )
-if test -n "$MOZ_DISABLE_DTD_DEBUG"; then
-    AC_DEFINE(MOZ_DISABLE_DTD_DEBUG)
-fi
-
 dnl ========================================================
 dnl Enable garbage collector
 dnl ========================================================
@@ -5004,7 +4990,6 @@ AC_SUBST(OS_ARCH)
 AC_SUBST(OS_RELEASE)
 AC_SUBST(OS_TEST)
 
-AC_SUBST(MOZ_DISABLE_DTD_DEBUG)
 AC_SUBST(MOZ_DISABLE_JAR_PACKAGING)
 AC_SUBST(MOZ_CHROME_FILE_FORMAT)