diff --git a/src/Log.cxx b/src/Log.cxx
index eed32cd74..4d37b36f7 100644
--- a/src/Log.cxx
+++ b/src/Log.cxx
@@ -119,6 +119,18 @@ LogError(const std::exception &e, const char *msg)
 	}
 }
 
+void
+FormatError(const std::exception &e, const char *fmt, ...)
+{
+	char msg[1024];
+	va_list ap;
+	va_start(ap, fmt);
+	vsnprintf(msg, sizeof(msg), fmt, ap);
+	va_end(ap);
+
+	LogError(e, msg);
+}
+
 void
 LogError(const Error &error)
 {
diff --git a/src/Log.hxx b/src/Log.hxx
index b7d55210a..1cacf5c4e 100644
--- a/src/Log.hxx
+++ b/src/Log.hxx
@@ -89,6 +89,10 @@ LogError(const std::exception &e);
 void
 LogError(const std::exception &e, const char *msg);
 
+gcc_printf(2,3)
+void
+FormatError(const std::exception &e, const char *fmt, ...);
+
 gcc_printf(2,3)
 void
 FormatError(const Domain &domain, const char *fmt, ...);