diff --git a/bibtex-tidy.js b/bibtex-tidy.js
index 2ff63a7..bd30814 100644
--- a/bibtex-tidy.js
+++ b/bibtex-tidy.js
@@ -4214,7 +4214,7 @@ var optionDefinitions = [
     toCLI: (val) => {
       if (Array.isArray(val) && val.length > 0) {
         if (JSON.stringify(val) === JSON.stringify(DEFAULT_FIELD_SORT)) {
-          return "--sort_fields";
+          return "--sort-fields";
         }
         return "--sort-fields=".concat(val.join(","));
       }
diff --git a/bin/bibtex-tidy b/bin/bibtex-tidy
index f05afe4..eaa67e4 100755
--- a/bin/bibtex-tidy
+++ b/bin/bibtex-tidy
@@ -502,7 +502,7 @@ var optionDefinitions = [
     toCLI: (val) => {
       if (Array.isArray(val) && val.length > 0) {
         if (JSON.stringify(val) === JSON.stringify(DEFAULT_FIELD_SORT)) {
-          return "--sort_fields";
+          return "--sort-fields";
         }
         return `--sort-fields=${val.join(",")}`;
       }
diff --git a/docs/bundle.js b/docs/bundle.js
index ac7f683..f175977 100644
--- a/docs/bundle.js
+++ b/docs/bundle.js
@@ -6060,7 +6060,7 @@ var __generator =
         key: "sortFields",
         cli: { "--sort-fields": (r) => (r.length > 0 ? r : !0) },
         toCLI: (r) => {
-          if (Array.isArray(r) && r.length > 0) return JSON.stringify(r) === JSON.stringify(fo) ? "--sort_fields" : "--sort-fields=".concat(r.join(","));
+          if (Array.isArray(r) && r.length > 0) return JSON.stringify(r) === JSON.stringify(fo) ? "--sort-fields" : "--sort-fields=".concat(r.join(","));
           if (r === !0) return "--sort-fields";
         },
         title: "Sort fields",
diff --git a/src/optionDefinitions.ts b/src/optionDefinitions.ts
index bd4e1f9..f4b2383 100644
--- a/src/optionDefinitions.ts
+++ b/src/optionDefinitions.ts
@@ -314,7 +314,7 @@ export const optionDefinitions: OptionDefinition[] = [
 		toCLI: (val) => {
 			if (Array.isArray(val) && val.length > 0) {
 				if (JSON.stringify(val) === JSON.stringify(DEFAULT_FIELD_SORT)) {
-					return '--sort_fields';
+					return '--sort-fields';
 				}
 				return `--sort-fields=${val.join(',')}`;
 			}