diff --git a/lib/cli.js b/lib/cli.js
index 1bdc3aa..e754c5d 100755
--- a/lib/cli.js
+++ b/lib/cli.js
@@ -18,7 +18,8 @@ program.
     "-v, --version",
     "json code style version")
   .option("-f, --fix",
-    "fix json file")
+    "fix json file",
+    false)
   .option("-q, --quiet",
     "quiet mode")
   .option("-s, --spaces <integer>",
@@ -34,7 +35,7 @@ program.parse(process.argv);
 function parse(path) {
   getFiles(path).map(processFile);
 
-  !program.fix || console.log(fixedFiles);
+  !program.opts().fix || console.log(fixedFiles);
 
   if (errors.includes(true)) {
     process.exit(1);
@@ -46,16 +47,16 @@ function parse(path) {
 function processFile(filePath) {
   try {
     const source = fs.readFileSync(filePath, "utf8");
-    const indentation = parseInt(program.spaces);
+    const indentation = parseInt(program.opts().spaces, 10);
     const formatted = formatter.formatJson(source, indentation);
-    const fileWithErrors = showDiff(program.quiet, source, formatted, filePath);
+    const fileWithErrors = showDiff(program.opts().quiet, source, formatted, filePath);
 
     errors.push(fileWithErrors);
 
-    let fixedFile = fixJsonFile(program.fix, filePath, formatted);
+    let fixedFile = fixJsonFile(program.opts().fix, filePath, formatted);
     fixedFiles.push(fixedFile);
   } catch (e) {
-    if (typeof program.spaces != "number") {
+    if (isNaN(program.opts().spaces)) {
       console.log("-s / --spaces should receive integer as parameter");
       process.exit(1);
     }