diff --git a/unittest/force-styles/error_stats.cpp b/unittest/force-styles/error_stats.cpp
index c58ff4c0ee..a22f299f55 100644
--- a/unittest/force-styles/error_stats.cpp
+++ b/unittest/force-styles/error_stats.cpp
@@ -47,16 +47,7 @@ double ErrorStats::dev() const
 
 std::ostream &operator<<(std::ostream &out, const ErrorStats &stats)
 {
-    const std::ios_base::fmtflags flags = out.flags();
-    const std::streamsize width         = out.width(10);
-    const std::streamsize prec          = out.precision(3);
-
-    out << std::scientific << "Average: " << stats.avg() << " StdDev: " << stats.dev()
-        << " MaxErr: " << stats.max();
-
-    out.precision(prec);
-    out.width(width);
-    out.flags(flags);
-
-    return out << " @ item: " << stats.idx();
+    out << fmt::format("Average: {:10.3e} StdDev: {:10.3e} MaxErr: {:10.3e} @ item: {}",
+                       stats.avg(), stats.dev(), stats.max(), stats.idx());
+    return out;
 }