diff --git a/nomad/structs/funcs.go b/nomad/structs/funcs.go
index bc57c2804..751befd65 100644
--- a/nomad/structs/funcs.go
+++ b/nomad/structs/funcs.go
@@ -18,10 +18,6 @@ import (
 // MergeMultierrorWarnings takes job warnings and canonicalize warnings and
 // merges them into a returnable string. Both the errors may be nil.
 func MergeMultierrorWarnings(warnings ...error) string {
-	if len(warnings) == 0 {
-		return ""
-	}
-
 	var warningMsg multierror.Error
 	for _, warn := range warnings {
 		if warn != nil {
@@ -29,6 +25,10 @@ func MergeMultierrorWarnings(warnings ...error) string {
 		}
 	}
 
+	if len(warningMsg.Errors) == 0 {
+		return ""
+	}
+
 	// Set the formatter
 	warningMsg.ErrorFormat = warningsFormatter
 	return warningMsg.Error()