diff --git a/crates/nu-command/src/strings/encode_decode/decode_base64.rs b/crates/nu-command/src/strings/encode_decode/decode_base64.rs
index 9896d89b9..21ad5600e 100644
--- a/crates/nu-command/src/strings/encode_decode/decode_base64.rs
+++ b/crates/nu-command/src/strings/encode_decode/decode_base64.rs
@@ -2,7 +2,7 @@ use super::base64::{operate, ActionType, CHARACTER_SET_DESC};
 use nu_protocol::ast::Call;
 use nu_protocol::engine::{Command, EngineState, Stack};
 use nu_protocol::{
-    Category, Example, PipelineData, ShellError, Signature, Span, SyntaxShape, Type, Value,
+    Category, Example, PipelineData, ShellError, Signature, Span, SyntaxShape, Value,
 };
 
 #[derive(Clone)]
@@ -69,14 +69,6 @@ impl Command for DecodeBase64 {
     ) -> Result<PipelineData, ShellError> {
         operate(ActionType::Decode, engine_state, stack, call, input)
     }
-
-    fn input_type(&self) -> Type {
-        Type::Any
-    }
-
-    fn output_type(&self) -> Type {
-        Type::Any
-    }
 }
 
 #[cfg(test)]
diff --git a/crates/nu-command/src/strings/encode_decode/encode_base64.rs b/crates/nu-command/src/strings/encode_decode/encode_base64.rs
index 6ef29fb96..b0e4afd73 100644
--- a/crates/nu-command/src/strings/encode_decode/encode_base64.rs
+++ b/crates/nu-command/src/strings/encode_decode/encode_base64.rs
@@ -26,6 +26,7 @@ impl Command for EncodeBase64 {
                 SyntaxShape::CellPath,
                 "optionally base64 encode data by column paths",
             )
+            .output_type(Type::String)
             .category(Category::Hash)
     }
 
@@ -57,14 +58,6 @@ impl Command for EncodeBase64 {
     ) -> Result<PipelineData, ShellError> {
         operate(ActionType::Encode, engine_state, stack, call, input)
     }
-
-    fn input_type(&self) -> Type {
-        Type::Any
-    }
-
-    fn output_type(&self) -> Type {
-        Type::String
-    }
 }
 
 #[cfg(test)]