diff --git a/action.yml b/action.yml
index 33f6041..9f26e7f 100644
--- a/action.yml
+++ b/action.yml
@@ -29,7 +29,6 @@ inputs:
   prettier_version:
     description: Specific version of prettier (by default just use the latest version)
     required: false
-    default: False
 
 runs:
   using: 'docker'
diff --git a/entrypoint.sh b/entrypoint.sh
index 00e3485..500329d 100755
--- a/entrypoint.sh
+++ b/entrypoint.sh
@@ -37,7 +37,7 @@ _git_push() {
 
 # PROGRAM
 echo "Installing prettier..."
-if ! "$INPUT_PRETTIER_VERSION"; then
+if -z "$INPUT_PRETTIER_VERSION"; then
   npm install --silent --global prettier
 else
   npm install --silent --global prettier@$INPUT_PRETTIER_VERSION