diff --git a/Makefile b/Makefile
index 4959a75e2dd5..756a33876c4e 100644
--- a/Makefile
+++ b/Makefile
@@ -46,8 +46,9 @@ TAGS ?=
 TMPDIR := $(shell mktemp -d 2>/dev/null || mktemp -d -t 'gitea-temp')
 
 SWAGGER_SPEC := templates/swagger/v1_json.tmpl
-SWAGGER_SPEC_S_TMPL := s|"basePath":\s*"/api/v1"|"basePath": "{{AppSubUrl}}/api/v1"|g
-SWAGGER_SPEC_S_JSON := s|"basePath":\s*"{{AppSubUrl}}/api/v1"|"basePath": "/api/v1"|g
+SWAGGER_SPEC_S_TMPL := s|"basePath": *"/api/v1"|"basePath": "{{AppSubUrl}}/api/v1"|g
+SWAGGER_SPEC_S_JSON := s|"basePath": *"{{AppSubUrl}}/api/v1"|"basePath": "/api/v1"|g
+SWAGGER_NEWLINE_COMMAND := -e '$$a\'
 
 TEST_MYSQL_HOST ?= mysql:3306
 TEST_MYSQL_DBNAME ?= testgitea
@@ -111,6 +112,7 @@ generate-swagger:
 	fi
 	swagger generate spec -o './$(SWAGGER_SPEC)'
 	$(SED_INPLACE) '$(SWAGGER_SPEC_S_TMPL)' './$(SWAGGER_SPEC)'
+	$(SED_INPLACE) $(SWAGGER_NEWLINE_COMMAND) './$(SWAGGER_SPEC)'
 
 .PHONY: swagger-check
 swagger-check: generate-swagger
diff --git a/templates/swagger/v1_json.tmpl b/templates/swagger/v1_json.tmpl
index 550b2fc90ad9..78305ba3e171 100644
--- a/templates/swagger/v1_json.tmpl
+++ b/templates/swagger/v1_json.tmpl
@@ -9222,4 +9222,4 @@
       "SudoHeader": []
     }
   ]
-}
\ No newline at end of file
+}