diff --git a/fec/build-dos.bat b/fec/build-dos.bat
index 02425ec..ecde577 100644
--- a/fec/build-dos.bat
+++ b/fec/build-dos.bat
@@ -6,9 +6,6 @@ if exist BUILD.OK del BUILD.OK
 if exist BUILD.FAIL del BUILD.FAIL
 if exist fec.exe del fec.exe
 if exist __wcl__.lnk del __wcl__.lnk
-rem WCL writes test objects into the current directory. Remove all prior build
-rem artifacts before the wildcard link so 32-bit test objects cannot enter the
-rem 16-bit compiler executable.
 if exist *.obj del *.obj
 
 if "%WATCOM%"=="" set WATCOM=C:\DEVEL\WATCOMC
@@ -30,17 +27,15 @@ wcl -q -za -wx -bt=dos -ml -k32768 -c -fo=m7.obj src\m7.c
 if errorlevel 1 goto build_fail
 wcl -q -za -wx -bt=dos -ml -k32768 -c -fo=own.obj src\own.c
 if errorlevel 1 goto build_fail
-wcl -q -za -wx -bt=dos -ml -k32768 -c -fo=check.obj src\check.c
+wcl -q -za -wx -bt=dos -ml -k32768 -c -fo=check.obj src\check_m7.c
 if errorlevel 1 goto build_fail
 wcl -q -za -wx -bt=dos -ml -k32768 -c -fo=lower.obj src\lower.c
 if errorlevel 1 goto build_fail
-rem Use an unambiguous short object name for the emit_c source.
-wcl -q -za -wx -bt=dos -ml -k32768 -c -fo=emitc.obj src\emit_c.c
+rem Use an unambiguous short object name for the M7 emitter source.
+wcl -q -za -wx -bt=dos -ml -k32768 -c -fo=emitc.obj src\emit_c_m7.c
 if errorlevel 1 goto build_fail
 wcl -q -za -wx -bt=dos -ml -k32768 -c -fo=driver.obj src\driver.c
 if errorlevel 1 goto build_fail
-rem DOS command lines are limited to roughly 126 characters. All stale objects
-rem were removed above, so the wildcard contains exactly this build's objects.
 wcl -q -za -wx -bt=dos -ml -k32768 -fe=fec.exe *.obj
 if errorlevel 1 goto build_fail
 if not exist fec.exe goto build_fail