diff --git a/build/build-x64.bat b/build/build-x64.bat
index 6276677c..9fdf75de 100644
--- a/build/build-x64.bat
+++ b/build/build-x64.bat
@@ -20,14 +20,14 @@ nmake /nologo /f makefile.mak
 cd perl
 set OOPATH=%PATH%
 set PATH=%OOPATH%;c:\mozilla-build\perl-5.8-x64\bin
-nmake /nologo /f makefile-58.mak clean
-nmake /nologo /f makefile-58.mak
+nmake /nologo /s /f makefile-58.mak clean
+nmake /nologo /s /f makefile-58.mak
 set PATH=%OOPATH%;c:\mozilla-build\perl-5.10-x64\bin
-nmake /nologo /f makefile-510.mak clean
-nmake /nologo /f makefile-510.mak
+nmake /nologo /s /f makefile-510.mak clean
+nmake /nologo /s /f makefile-510.mak
 set PATH=%OOPATH%;c:\mozilla-build\perl-5.12-x64\bin
-nmake /nologo /f makefile-512.mak clean
-nmake /nologo /f makefile-512.mak
+nmake /nologo /s /f makefile-512.mak clean
+nmake /nologo /s /f makefile-512.mak
 cd ..\..\build
 set PATH=%OPATH%
 call release-x64.bat
diff --git a/build/build-x86.bat b/build/build-x86.bat
index 5f252252..981f7150 100644
--- a/build/build-x86.bat
+++ b/build/build-x86.bat
@@ -16,14 +16,14 @@ nmake /nologo /f makefile.mak
 cd perl
 set OOPATH=%PATH%
 set PATH=%OOPATH%;c:\mozilla-build\perl-5.8-x86\bin
-nmake /nologo /f makefile-58.mak clean
-nmake /nologo /f makefile-58.mak
+nmake /nologo /s /f makefile-58.mak clean
+nmake /nologo /s /f makefile-58.mak
 set PATH=%OOPATH%;c:\mozilla-build\perl-5.10-x86\bin
-nmake /nologo /f makefile-510.mak clean
-nmake /nologo /f makefile-510.mak
+nmake /nologo /s /f makefile-510.mak clean
+nmake /nologo /s /f makefile-510.mak
 set PATH=%OOPATH%;c:\mozilla-build\perl-5.12-x86\bin
-nmake /nologo /f makefile-512.mak clean
-nmake /nologo /f makefile-512.mak
+nmake /nologo /s /f makefile-512.mak clean
+nmake /nologo /s /f makefile-512.mak
 cd ..\..\build
 call compile-po-files.bat
 cd ..\build
diff --git a/plugins/perl/makefile-510.mak b/plugins/perl/makefile-510.mak
index 4cb8b550..619566b5 100644
--- a/plugins/perl/makefile-510.mak
+++ b/plugins/perl/makefile-510.mak
@@ -29,8 +29,8 @@ $(TARGET): perl.obj perl.def
 	$(LINK) /DLL /out:$(TARGET) perl.obj $(LDFLAGS) $(PERLLIB).lib /libpath:$(PERLPATH) /DELAYLOAD:$(PERLLIB).dll DELAYIMP.LIB user32.lib shell32.lib advapi32.lib /def:perl.def
 
 clean:
-	del $(TARGET)
-	del *.obj
-	del perl.def
-	del *.lib
-	del *.exp
+	@del $(TARGET)
+	@del *.obj
+	@del perl.def
+	@del *.lib
+	@del *.exp
diff --git a/plugins/perl/makefile-512.mak b/plugins/perl/makefile-512.mak
index 10ee054d..4ba6a7f7 100644
--- a/plugins/perl/makefile-512.mak
+++ b/plugins/perl/makefile-512.mak
@@ -29,8 +29,8 @@ $(TARGET): perl.obj perl.def
 	$(LINK) /DLL /out:$(TARGET) perl.obj $(LDFLAGS) $(PERLLIB).lib /libpath:$(PERLPATH) /DELAYLOAD:$(PERLLIB).dll DELAYIMP.LIB user32.lib shell32.lib advapi32.lib /def:perl.def
 
 clean:
-	del $(TARGET)
-	del *.obj
-	del perl.def
-	del *.lib
-	del *.exp
+	@del $(TARGET)
+	@del *.obj
+	@del perl.def
+	@del *.lib
+	@del *.exp
diff --git a/plugins/perl/makefile-58.mak b/plugins/perl/makefile-58.mak
index e26c6220..7af53b1c 100644
--- a/plugins/perl/makefile-58.mak
+++ b/plugins/perl/makefile-58.mak
@@ -29,8 +29,8 @@ $(TARGET): perl.obj perl.def
 	$(LINK) /DLL /out:$(TARGET) perl.obj $(LDFLAGS) $(PERLLIB).lib /libpath:$(PERLPATH) /DELAYLOAD:$(PERLLIB).dll DELAYIMP.LIB user32.lib shell32.lib advapi32.lib /def:perl.def
 
 clean:
-	del $(TARGET)
-	del *.obj
-	del perl.def
-	del *.lib
-	del *.exp
+	@del $(TARGET)
+	@del *.obj
+	@del perl.def
+	@del *.lib
+	@del *.exp