diff --git a/src/lib.rs b/src/lib.rs
index 5c5efc8..c50a84c 100644
--- a/src/lib.rs
+++ b/src/lib.rs
@@ -70,7 +70,7 @@ pub struct Args {
 #[allow(dead_code)]
 pub struct ServiceResult<'a> {
     pub success: bool,
-    buf: &'static mut [i32],
+    buf: &'a mut [i32],
     pub rets: &'a [i32],
 }
 
@@ -145,15 +145,10 @@ macro_rules! call_method {
 /// a macro for creating a ServiceResult struct, used with the `call!` macro
 #[macro_export]
 macro_rules! service_result {
-    ($nargs:expr, $nrets:expr) => { unsafe {
-        static mut BUF: [i32; $nargs + $nrets] = [0; $nargs + $nrets];
-        let rets: &[i32] = &[];
-        let results = $crate::ServiceResult {
-            success: false,
-            buf: &mut BUF,
-            rets,
-        };
-        results
+    ($nargs:expr, $nrets:expr) => { $crate::ServiceResult {
+        success: false,
+        buf: &mut [0; $nargs + $nrets],
+        rets: &[],
     }};
 }
 
@@ -161,16 +156,13 @@ macro_rules! 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) => { unsafe {
-        static mut BUF: [i32; $nargs + $nrets + 1] = [0; $nargs + $nrets + 1];
-        let rets: &[i32] = &[];
-        let results = $crate::ServiceResult {
+    ($nargs:expr, $nrets:expr) => {
+        $crate::ServiceResult {
             success: false,
-            buf: &mut BUF,
-            rets,
-        };
-        results
-    }};
+            buf: &mut [0; $nargs + $nrets + 1],
+            rets: &[],
+        }
+    };
 }
 
 /// # ofw_call