diff --git a/Cargo.lock b/Cargo.lock
index 8b04243d4..90716bf6c 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -303,7 +303,7 @@ checksum = "e78d4f1cc4ae33bbfc157ed5d5a5ef3bc29227303d595861deb238fcec4e9457"
 
 [[package]]
 name = "enclave_build"
-version = "0.1.0"
+version = "0.2.0"
 dependencies = [
  "aws-nitro-enclaves-image-format",
  "base64",
diff --git a/enclave_build/Cargo.toml b/enclave_build/Cargo.toml
index ff2ef6927..a8548cb98 100644
--- a/enclave_build/Cargo.toml
+++ b/enclave_build/Cargo.toml
@@ -1,6 +1,6 @@
 [package]
 name = "enclave_build"
-version = "0.1.0"
+version = "0.2.0"
 authors = ["The AWS Nitro Enclaves Team <aws-nitro-enclaves-devel@amazon.com>"]
 edition = "2018"
 rust-version = "1.58"
diff --git a/enclave_build/src/main.rs b/enclave_build/src/main.rs
index 52af2265d..ba69d40c2 100644
--- a/enclave_build/src/main.rs
+++ b/enclave_build/src/main.rs
@@ -131,11 +131,9 @@ fn main() {
     let linuxkit_path = matches.value_of("linuxkit_path").unwrap();
     let output = matches.value_of("output").unwrap();
     let signing_certificate = matches
-        .value_of("signing_certificate")
-        .map(|val| val.to_string());
-    let private_key = matches
-        .value_of("private_certificate")
+        .value_of("signing-certificate")
         .map(|val| val.to_string());
+    let private_key = matches.value_of("private-key").map(|val| val.to_string());
     let img_name = matches.value_of("image_name").map(|val| val.to_string());
     let img_version = matches.value_of("image_version").map(|val| val.to_string());
     let metadata = matches.value_of("metadata").map(|val| val.to_string());
@@ -144,6 +142,7 @@ fn main() {
         .read(true)
         .write(true)
         .create(true)
+        .truncate(true)
         .open(output)
         .expect("Failed to create output file");