diff --git a/DeviceAdapters/ArduinoCounter/ArduinoCounter.vcxproj b/DeviceAdapters/ArduinoCounter/ArduinoCounter.vcxproj
index 7c73b01d5..0e723d7e4 100644
--- a/DeviceAdapters/ArduinoCounter/ArduinoCounter.vcxproj
+++ b/DeviceAdapters/ArduinoCounter/ArduinoCounter.vcxproj
@@ -11,7 +11,7 @@
     </ProjectConfiguration>
   </ItemGroup>
   <PropertyGroup Label="Globals">
-    <ProjectGuid>{067D4A8-8C32-40D3-BA9F-6B388ECCD714}</ProjectGuid>
+    <ProjectGuid>{8331c4e1-6c17-481e-9b4f-232db77d95cb}</ProjectGuid>
     <RootNamespace>Arduino</RootNamespace>
     <WindowsTargetPlatformVersion>10.0</WindowsTargetPlatformVersion>
   </PropertyGroup>
@@ -97,4 +97,4 @@
   <Import Project="$(VCTargetsPath)\Microsoft.Cpp.targets" />
   <ImportGroup Label="ExtensionTargets">
   </ImportGroup>
-</Project>
\ No newline at end of file
+</Project>
diff --git a/micromanager.sln b/micromanager.sln
index a2e021c9a..c9179b3a5 100644
--- a/micromanager.sln
+++ b/micromanager.sln
@@ -472,7 +472,7 @@ Project("{8BC9CEB8-8B4A-11D0-8D11-00A0C91BC942}") = "AlliedVisionCamera", "Devic
 EndProject
 Project("{8BC9CEB8-8B4A-11D0-8D11-00A0C91BC942}") = "BH_DCC_DCU", "DeviceAdapters\BH_DCC_DCU\BH_DCC_DCU.vcxproj", "{9AE989AF-F6B7-45D7-983B-A7629FBF8F1B}"
 EndProject
-Project("{8BC9CEB8-8B4A-11D0-8D11-00A0C91BC942}") = "ArduinoCounter", "DeviceAdapters\ArduinoCounter\ArduinoCounter.vcxproj", "{0067D4A8-0000-0000-0000-000000000000}"
+Project("{8BC9CEB8-8B4A-11D0-8D11-00A0C91BC942}") = "ArduinoCounter", "DeviceAdapters\ArduinoCounter\ArduinoCounter.vcxproj", "{8331c4e1-6c17-481e-9b4f-232db77d95cb}"
 EndProject
 Project("{8BC9CEB8-8B4A-11D0-8D11-00A0C91BC942}") = "ESP32", "DeviceAdapters\ESP32\ESP32.vcxproj", "{0C72846A-BCFA-4F75-91AF-D9F5CA01E6B2}"
 EndProject
@@ -1916,12 +1916,12 @@ Global
 		{9AE989AF-F6B7-45D7-983B-A7629FBF8F1B}.Release|x64.ActiveCfg = Release|x64
 		{9AE989AF-F6B7-45D7-983B-A7629FBF8F1B}.Release|x64.Build.0 = Release|x64
 		{9AE989AF-F6B7-45D7-983B-A7629FBF8F1B}.Release|x86.ActiveCfg = Release|x64
-		{0067D4A8-0000-0000-0000-000000000000}.Debug|x64.ActiveCfg = Debug|x64
-		{0067D4A8-0000-0000-0000-000000000000}.Debug|x64.Build.0 = Debug|x64
-		{0067D4A8-0000-0000-0000-000000000000}.Debug|x86.ActiveCfg = Debug|x64
-		{0067D4A8-0000-0000-0000-000000000000}.Release|x64.ActiveCfg = Release|x64
-		{0067D4A8-0000-0000-0000-000000000000}.Release|x64.Build.0 = Release|x64
-		{0067D4A8-0000-0000-0000-000000000000}.Release|x86.ActiveCfg = Release|x64
+		{8331c4e1-6c17-481e-9b4f-232db77d95cb}.Debug|x64.ActiveCfg = Debug|x64
+		{8331c4e1-6c17-481e-9b4f-232db77d95cb}.Debug|x64.Build.0 = Debug|x64
+		{8331c4e1-6c17-481e-9b4f-232db77d95cb}.Debug|x86.ActiveCfg = Debug|x64
+		{8331c4e1-6c17-481e-9b4f-232db77d95cb}.Release|x64.ActiveCfg = Release|x64
+		{8331c4e1-6c17-481e-9b4f-232db77d95cb}.Release|x64.Build.0 = Release|x64
+		{8331c4e1-6c17-481e-9b4f-232db77d95cb}.Release|x86.ActiveCfg = Release|x64
 		{0C72846A-BCFA-4F75-91AF-D9F5CA01E6B2}.Debug|x64.ActiveCfg = Debug|x64
 		{0C72846A-BCFA-4F75-91AF-D9F5CA01E6B2}.Debug|x64.Build.0 = Debug|x64
 		{0C72846A-BCFA-4F75-91AF-D9F5CA01E6B2}.Debug|x86.ActiveCfg = Debug|x64