diff --git a/account_manager/src/common.rs b/account_manager/src/common.rs
index 23d7fed87..529d3991e 100644
--- a/account_manager/src/common.rs
+++ b/account_manager/src/common.rs
@@ -37,3 +37,57 @@ pub fn base_wallet_dir(matches: &ArgMatches, arg: &'static str) -> Result<PathBu
         PathBuf::new().join(".lighthouse").join("wallets"),
     )
 }
+
+/// Remove any number of newline or carriage returns from the end of a vector of bytes.
+pub fn strip_off_newlines(mut bytes: Vec<u8>) -> Vec<u8> {
+    let mut strip_off = 0;
+    for (i, byte) in bytes.iter().rev().enumerate() {
+        if *byte == b'\n' || *byte == b'\r' {
+            strip_off = i + 1;
+        } else {
+            break;
+        }
+    }
+    bytes.truncate(bytes.len() - strip_off);
+
+    bytes.to_vec()
+}
+
+#[cfg(test)]
+mod test {
+    use super::strip_off_newlines;
+
+    #[test]
+    fn test_strip_off() {
+        let expected = "hello world".as_bytes().to_vec();
+
+        assert_eq!(
+            strip_off_newlines("hello world\n".as_bytes().to_vec()),
+            expected
+        );
+        assert_eq!(
+            strip_off_newlines("hello world\n\n\n\n".as_bytes().to_vec()),
+            expected
+        );
+        assert_eq!(
+            strip_off_newlines("hello world\r".as_bytes().to_vec()),
+            expected
+        );
+        assert_eq!(
+            strip_off_newlines("hello world\r\r\r\r\r".as_bytes().to_vec()),
+            expected
+        );
+        assert_eq!(
+            strip_off_newlines("hello world\r\n".as_bytes().to_vec()),
+            expected
+        );
+        assert_eq!(
+            strip_off_newlines("hello world\r\n\r\n".as_bytes().to_vec()),
+            expected
+        );
+        assert_eq!(
+            strip_off_newlines("hello world".as_bytes().to_vec()),
+            expected
+        );
+    }
+}
diff --git a/account_manager/src/wallet/create.rs b/account_manager/src/wallet/create.rs
index cb8d6f47c..b6c43e0b2 100644
--- a/account_manager/src/wallet/create.rs
+++ b/account_manager/src/wallet/create.rs
@@ -1,4 +1,7 @@
-use crate::{common::random_password, BASE_DIR_FLAG};
+use crate::{
+    common::{random_password, strip_off_newlines},
+    BASE_DIR_FLAG,
+};
 use clap::{App, Arg, ArgMatches};
 use eth2_wallet::{
     bip39::{Language, Mnemonic, MnemonicType},
@@ -104,7 +107,10 @@ pub fn cli_run(matches: &ArgMatches, base_dir: PathBuf) -> Result<(), String> {
 
     let wallet_password = fs::read(&wallet_password_path)
         .map_err(|e| format!("Unable to read {:?}: {:?}", wallet_password_path, e))
-        .map(|bytes| PlainText::from(bytes))?;
+        .map(|bytes| {
+            let bytes = strip_off_newlines(bytes);
+            PlainText::from(bytes)
+        })?;
 
     let wallet = mgr
         .create_wallet(name, wallet_type, &mnemonic, wallet_password.as_bytes())