diff --git a/eng/common/scripts/Invoke-GitHubAPI.ps1 b/eng/common/scripts/Invoke-GitHubAPI.ps1
index 6b96f0920f41..c4a9fa5bb11e 100644
--- a/eng/common/scripts/Invoke-GitHubAPI.ps1
+++ b/eng/common/scripts/Invoke-GitHubAPI.ps1
@@ -402,7 +402,8 @@ function Update-GitHubIssue {
           -Body ($parameters | ConvertTo-Json) `
           -Uri $uri `
           -Headers (Get-GitHubApiHeaders -token $AuthToken) `
-          -MaximumRetryCount 3
+          -MaximumRetryCount 3 `
+          -ContentType "application/json"
 }
 
 function Remove-GitHubSourceReferences  {