diff --git a/src/lib.rs b/src/lib.rs
index 63f37f7..993c7d7 100644
--- a/src/lib.rs
+++ b/src/lib.rs
@@ -63,24 +63,11 @@ mod tests;
 pub struct Args {
     pub service: NTSTR,
     // ieee 1275, 2.4.1 General conventions: "All numbers on the stack are signed integers, _32 bits[...]"
-    pub nrets: i32,
     pub nargs: i32,
+    pub nrets: i32,
     // inheriting structs will continue from here
 }
 
-/// # ServiceResult
-/// a generic structure for accessing the results of a service call
-#[allow(dead_code)]
-pub struct ServiceResult<'a> {
-    /// whether or not the service call was successful
-    pub success: bool,
-    /// a buffer for storing the arguments and return values of the service call
-    /// should not be used directly
-    pub buf: &'a mut [i32],
-    /// a slice of the buffer containing the return values of the service call
-    pub rets: &'a [i32],
-}
-
 /// # call!
 /// a macro for calling OpenFirmware services
 /// ## example
@@ -126,9 +113,6 @@ macro_rules! call {
 ///
 /// let entry_fn: EntryFunction = unimplemented!("get the entry function from somewhere");
 /// let package_instance: i32 = unimplemented!("get the package instance from somewhere");
-/// // note the usage of the `method_service_result!` macro instead of `service_result!`
-/// // this is required as the `call_method!` macro requires a
-/// // slightly different ServiceResult struct configuration
 /// // <entry function>, <package instance>, <method name>, <# of args>, <# of rets>, <args...>
 /// let (success, returns): (bool, [i32; 1]) = call_method!(entry_fn, package_instance, ntstr!("seek"), 2, 1, 0, 0);
 /// if success {
@@ -158,30 +142,6 @@ macro_rules! call_method {
     };
 }
 
-/// # service_result!
-/// a macro for creating a ServiceResult struct, used with the `call!` macro
-#[macro_export]
-macro_rules! service_result {
-    ($nargs:expr, $nrets:expr) => { $crate::ServiceResult {
-        success: false,
-        buf: &mut [0; $nargs + $nrets],
-        rets: &[],
-    }};
-}
-
-/// # method_service_result!
-/// a macro for creating a ServiceResult struct, used with the `call_method!` macro
-#[macro_export]
-macro_rules! method_service_result {
-    ($nargs:expr, $nrets:expr) => {
-        $crate::ServiceResult {
-            success: false,
-            buf: &mut [0; $nargs + $nrets + 1],
-            rets: &[],
-        }
-    };
-}
-
 /// # ofw_call
 /// a function to call any OpenFirmware-provided service
 /// usage of the macro `call!` is preferred, but this function can be used directly
diff --git a/src/tests.rs b/src/tests.rs
index 4fcddab..63b9d40 100644
--- a/src/tests.rs
+++ b/src/tests.rs
@@ -39,7 +39,7 @@ fn call_ofw() {
     let entry_fn: EntryFunction = test_entry_function;
     let (success, results) = call!(entry_fn, ntstr!("test"), 1, 1, ntstr!("test"));
     assert!(success);
-    assert_eq!(results[0], 0);
+    assert_eq!(results[0], OFW_FALSE);
 }