diff --git a/src/options.go b/src/options.go
index 811615eb..3692f0c3 100644
--- a/src/options.go
+++ b/src/options.go
@@ -995,7 +995,7 @@ func parsePreviewWindow(opts *previewOpts, input string) {
 
 	tokens := strings.Split(input, ":")
 	sizeRegex := regexp.MustCompile("^[0-9]+%?$")
-	offsetRegex := regexp.MustCompile("^\\+([0-9]+|{[0-9]+})(-[0-9]+)?$")
+	offsetRegex := regexp.MustCompile("^\\+([0-9]+|{-?[0-9]+})(-[0-9]+)?$")
 	for _, token := range tokens {
 		switch token {
 		case "":