diff --git a/lua/overseer/component/on_result_diagnostics.lua b/lua/overseer/component/on_result_diagnostics.lua
index e084aa3..f7003c8 100644
--- a/lua/overseer/component/on_result_diagnostics.lua
+++ b/lua/overseer/component/on_result_diagnostics.lua
@@ -68,7 +68,7 @@ local comp = {
               message = item.text,
               severity = type_to_severity[item.type] or vim.diagnostic.severity.ERROR,
               lnum = (item.lnum or 1) - 1,
-              end_lnum = item.end_lnum and (item.end_lnum - 1),
+              end_lnum = (item.end_lnum and item.end_lnum > 0) and (item.end_lnum - 1) or item.lnum,
               col = item.col or 0,
               end_col = item.end_col,
               source = task.name,