diff --git a/winbuild/build.py b/winbuild/build.py
index 487977adb..1fbfa14a6 100644
--- a/winbuild/build.py
+++ b/winbuild/build.py
@@ -16,7 +16,7 @@ def setup_vms():
         for arch in ('', X64_EXT):
             ret.append("virtualenv -p c:/Python%s%s/python.exe --clear %s%s%s"
                        % (py, arch, VIRT_BASE, py, arch))
-            ret.append("%s%s%s\Scripts\pip.exe install nose" %
+            ret.append(r"%s%s%s\Scripts\pip.exe install nose" %
                        (VIRT_BASE, py, arch))
     return "\n".join(ret)
 
diff --git a/winbuild/build_dep.py b/winbuild/build_dep.py
index 4c397236b..fb4d55d8c 100644
--- a/winbuild/build_dep.py
+++ b/winbuild/build_dep.py
@@ -13,6 +13,7 @@ def _relpath(*args):
 def _relbuild(*args):
     return _relpath('build', *args)
 
+
 build_dir = _relpath('build')
 inc_dir = _relpath('depends')
 
@@ -108,7 +109,7 @@ set MSBUILD=C:\Windows\Microsoft.NET\Framework64\v4.0.30319\MSBuild.exe
 set CMAKE="cmake.exe"
 set INCLIB=%~dp0\depends
 set BUILD=%~dp0\build
-""" + "\n".join('set %s=%%BUILD%%\%s' % (k.upper(), v['dir'])
+""" + "\n".join(r'set %s=%%BUILD%%\%s' % (k.upper(), v['dir'])
                 for (k, v) in libs.items() if v['dir'])