diff --git a/flake.nix b/flake.nix
index f6c279b..636f4d0 100644
--- a/flake.nix
+++ b/flake.nix
@@ -19,8 +19,7 @@
     {
       formatter = forEachSystem (pkgs: pkgs.nixfmt-tree);
 
-      devShells = forEachSystem (
-        pkgs:
+      devShells = forEachSystem (pkgs:
         let
           devTools = [
             (pkgs.luajit.withPackages (
@@ -51,7 +50,6 @@
               pkgs.mermaid-cli
             ];
           };
-        }
-      );
+        });
     };
 }
diff --git a/lua/preview/presets.lua b/lua/preview/presets.lua
index d4b03cc..1b5333e 100644
--- a/lua/preview/presets.lua
+++ b/lua/preview/presets.lua
@@ -115,24 +115,6 @@ local function parse_asciidoctor(output)
   return diagnostics
 end
 
----@param output string
----@return preview.Diagnostic[]
-local function parse_mermaid(output)
-  local lnum = output:match('Parse error on line (%d+)')
-  if not lnum then
-    return {}
-  end
-  local msg = output:match('(Expecting .+)') or 'parse error'
-  return {
-    {
-      lnum = tonumber(lnum) - 1,
-      col = 0,
-      message = msg,
-      severity = vim.diagnostic.severity.ERROR,
-    },
-  }
-end
-
 ---@type preview.ProviderConfig
 M.typst = {
   ft = 'typst',
@@ -331,7 +313,19 @@ M.mermaid = {
     return (ctx.file:gsub('%.mmd$', '.svg'))
   end,
   error_parser = function(output)
-    return parse_mermaid(output)
+    local diagnostics = {}
+    for line in output:gmatch('[^\r\n]+') do
+      local lnum = line:match('^%s*Parse error on line (%d+)')
+      if lnum then
+        table.insert(diagnostics, {
+          lnum = tonumber(lnum) - 1,
+          col = 0,
+          message = line,
+          severity = vim.diagnostic.severity.ERROR,
+        })
+      end
+    end
+    return diagnostics
   end,
   clean = function(ctx)
     return { 'rm', '-f', (ctx.file:gsub('%.mmd$', '.svg')) }