diff --git a/.appveyor.yml b/.appveyor.yml
index 2b2222d..543c0dc 100644
--- a/.appveyor.yml
+++ b/.appveyor.yml
@@ -115,7 +115,7 @@ after_test:
       Execute-Action "generating code coverage report" {
           msbuild -p:Configuration=$env:CONFIGURATION -v:m -p:codecov=true
 
-          OpenCover.Console.exe -target:"$env:XUNIT20/xunit.console.x86.exe" -targetargs:"test/$env:APPVEYOR_PROJECT_NAME.Tests/bin/$env:CONFIGURATION/net471/$env:APPVEYOR_PROJECT_NAME.Tests.dll -noshadow" -register:user -filter:"+[*]* -[$env:APPVEYOR_PROJECT_NAME.Tests]* -[$env:APPVEYOR_PROJECT_NAME.Samples]*" -hideskipped:All -output:"./coverage.xml"
+          OpenCover.Console.exe -target:"$env:XUNIT20/xunit.console.x86.exe" -targetargs:"test/$env:APPVEYOR_PROJECT_NAME.Tests/bin/$env:CONFIGURATION/net45/$env:APPVEYOR_PROJECT_NAME.Tests.dll -noshadow" -register:user -filter:"+[*]* -[$env:APPVEYOR_PROJECT_NAME.Tests]* -[$env:APPVEYOR_PROJECT_NAME.Samples]*" -hideskipped:All -output:"./coverage.xml"
       }
 
 - ps: |
diff --git a/src/protobuf-net-data/protobuf-net-data.csproj b/src/protobuf-net-data/protobuf-net-data.csproj
index 61eff24..e3a648f 100644
--- a/src/protobuf-net-data/protobuf-net-data.csproj
+++ b/src/protobuf-net-data/protobuf-net-data.csproj
@@ -1,6 +1,8 @@
 <Project Sdk="Microsoft.NET.Sdk">
 
   <PropertyGroup>
+    <DebugType Condition="$(codecov) == 'true'">full</DebugType>
+    <DebugType Condition="$(codecov) != 'true'">pdbonly</DebugType>
     <GenerateDocumentationFile>true</GenerateDocumentationFile>
     <TargetFrameworks>net20;net30;net35;net40;net45;netstandard2.0</TargetFrameworks>
     <TreatWarningsAsErrors>true</TreatWarningsAsErrors>
diff --git a/test/protobuf-net-data.Tests/protobuf-net-data.Tests.csproj b/test/protobuf-net-data.Tests/protobuf-net-data.Tests.csproj
index 03727a5..9cfbf13 100644
--- a/test/protobuf-net-data.Tests/protobuf-net-data.Tests.csproj
+++ b/test/protobuf-net-data.Tests/protobuf-net-data.Tests.csproj
@@ -1,6 +1,7 @@
 <Project Sdk="Microsoft.NET.Sdk">
 
   <PropertyGroup>
+    <DebugType Condition="$(codecov) == 'true'">full</DebugType>
     <IsPackable>false</IsPackable>
     <TargetFramework>net471</TargetFramework>
     <TreatWarningsAsErrors>true</TreatWarningsAsErrors>