diff --git a/jcl/source/common/JclSysInfo.pas b/jcl/source/common/JclSysInfo.pas
index 76b381de79..b80c1d8ce9 100644
--- a/jcl/source/common/JclSysInfo.pas
+++ b/jcl/source/common/JclSysInfo.pas
@@ -4164,6 +4164,8 @@ function GetWindows10ReleaseName: String;
           Result := 'Windows 10 Creators Update';
        1709:
           Result := 'Windows 10 Fall Creators Update';
+       1803:
+          Result := 'Windows 10 April 2018 Update';
     else
       Result := '';
     end;
@@ -4187,6 +4189,8 @@ function GetWindows10ReleaseCodeName: String;
           Result := 'Redstone 2';
        1709:
           Result := 'Redstone 3';
+       1803:
+          Result := 'Redstone 4';
     else
       Result := '';
     end;