diff --git a/tools/jenkins/run_jenkins.sh b/tools/jenkins/run_jenkins.sh
index f79e739f6ae..67cfc2bb0a4 100755
--- a/tools/jenkins/run_jenkins.sh
+++ b/tools/jenkins/run_jenkins.sh
@@ -63,10 +63,6 @@ then
   # Prevent msbuild from picking up "platform" env variable, which would break the build
   unset platform
 
-  # TODO(jtattermusch): integrate nuget restore in a nicer way.
-  /cygdrive/c/nuget/nuget.exe restore vsprojects/grpc.sln
-  /cygdrive/c/nuget/nuget.exe restore src/csharp/Grpc.sln
-
   python tools/run_tests/run_tests.py -t -l $language -x report.xml $@ || true
 
 elif [ "$platform" == "macos" ]
diff --git a/tools/run_tests/build_csharp.sh b/tools/run_tests/build_csharp.sh
index eae7bd50405..6737d88b273 100755
--- a/tools/run_tests/build_csharp.sh
+++ b/tools/run_tests/build_csharp.sh
@@ -37,14 +37,6 @@ else
   MSBUILD_CONFIG="Release"
 fi
 
-# change to gRPC repo root
-cd $(dirname $0)/../..
+cd $(dirname $0)/../../src/csharp
 
-root=`pwd`
-
-if [ -n "$NUGET" ]
-then
-  $NUGET restore src/csharp/Grpc.sln
-fi
-
-xbuild /p:Configuration=$MSBUILD_CONFIG src/csharp/Grpc.sln
+xbuild /p:Configuration=$MSBUILD_CONFIG Grpc.sln
diff --git a/tools/run_tests/pre_build_c.bat b/tools/run_tests/pre_build_c.bat
new file mode 100644
index 00000000000..f0449f3c424
--- /dev/null
+++ b/tools/run_tests/pre_build_c.bat
@@ -0,0 +1,21 @@
+@rem Performs nuget restore step for C/C++.
+
+setlocal
+
+@rem enter repo root
+cd /d %~dp0\..\..
+
+@rem Location of nuget.exe
+set NUGET=C:\nuget\nuget.exe
+
+if exist %NUGET% (
+  %NUGET% restore vsprojects/grpc.sln || goto :error
+)
+
+endlocal
+
+goto :EOF
+
+:error
+echo Failed!
+exit /b %errorlevel%
diff --git a/tools/run_tests/pre_build_csharp.bat b/tools/run_tests/pre_build_csharp.bat
new file mode 100644
index 00000000000..853a8f43255
--- /dev/null
+++ b/tools/run_tests/pre_build_csharp.bat
@@ -0,0 +1,22 @@
+@rem Performs nuget restore step for C#.
+
+setlocal
+
+@rem enter repo root
+cd /d %~dp0\..\..
+
+@rem Location of nuget.exe
+set NUGET=C:\nuget\nuget.exe
+
+if exist %NUGET% (
+  %NUGET% restore vsprojects/grpc_csharp_ext.sln || goto :error
+  %NUGET% restore src/csharp/Grpc.sln || goto :error
+)
+
+endlocal
+
+goto :EOF
+
+:error
+echo Failed!
+exit /b %errorlevel%
diff --git a/tools/run_tests/pre_build_csharp.sh b/tools/run_tests/pre_build_csharp.sh
new file mode 100755
index 00000000000..42ff60bea22
--- /dev/null
+++ b/tools/run_tests/pre_build_csharp.sh
@@ -0,0 +1,41 @@
+#!/bin/bash
+# Copyright 2015, Google Inc.
+# All rights reserved.
+#
+# Redistribution and use in source and binary forms, with or without
+# modification, are permitted provided that the following conditions are
+# met:
+#
+#     * Redistributions of source code must retain the above copyright
+# notice, this list of conditions and the following disclaimer.
+#     * Redistributions in binary form must reproduce the above
+# copyright notice, this list of conditions and the following disclaimer
+# in the documentation and/or other materials provided with the
+# distribution.
+#     * Neither the name of Google Inc. nor the names of its
+# contributors may be used to endorse or promote products derived from
+# this software without specific prior written permission.
+#
+# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+# "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+# LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+# A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+# OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+# SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+# LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+# DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+# THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+# (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+# OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+
+set -ex
+
+# cd to gRPC csharp directory
+cd $(dirname $0)/../../src/csharp
+
+root=`pwd`
+
+if [ -n "$NUGET" ]
+then
+  $NUGET restore Grpc.sln
+fi
diff --git a/tools/run_tests/run_tests.py b/tools/run_tests/run_tests.py
index d38c0c96ee6..c85d6783581 100755
--- a/tools/run_tests/run_tests.py
+++ b/tools/run_tests/run_tests.py
@@ -167,7 +167,10 @@ class CLanguage(object):
     return ['buildtests_%s' % self.make_target, 'tools_%s' % self.make_target]
 
   def pre_build_steps(self):
-    return []
+    if self.platform == 'windows':
+      return [['tools\\run_tests\\pre_build_c.bat']]
+    else:
+      return []
 
   def build_steps(self):
     return []
@@ -321,7 +324,10 @@ class CSharpLanguage(object):
             for assembly in assemblies]
 
   def pre_build_steps(self):
-    return []
+    if self.platform == 'windows':
+      return [['tools\\run_tests\\pre_build_csharp.bat']]
+    else:
+      return [['tools/run_tests/pre_build_csharp.sh']]
 
   def make_targets(self):
     # For Windows, this target doesn't really build anything,