diff --git a/hpx-examples/src/main.rs b/hpx-examples/src/main.rs
index d53eb16..e47ac83 100644
--- a/hpx-examples/src/main.rs
+++ b/hpx-examples/src/main.rs
@@ -1,7 +1,7 @@
 #![feature(vec_into_raw_parts)]
 #![feature(random)]
 use core::array::from_fn;
-use std::{env, ffi::c_char, process, random};
+use std::{env, process, random};
 
 fn hpx_main(_: Vec<String>) -> i32 {
     let numbers: &[i32; 16384] = &from_fn(|_| random::random::<i32>());
diff --git a/hpx-sys/src/lib.rs b/hpx-sys/src/lib.rs
index d4a651e..bf83fe4 100644
--- a/hpx-sys/src/lib.rs
+++ b/hpx-sys/src/lib.rs
@@ -44,7 +44,7 @@ use std::env::Args;
 use std::ffi::{CString, CStr};
 use std::os::raw::c_char;
 
-static FUNC_HOLDER: Option<fn (Vec<String>) -> i32> = None;
+static mut FUNC_HOLDER: Option<fn (Vec<String>) -> i32> = None;
 
 // Convert arguments from *mut *mut c_char to Vec<String>
 // and call the saved Rust version of the function.
@@ -66,7 +66,7 @@ fn c_init(argc: i32, argv: *mut *mut c_char) -> i32 {
 
 pub fn init(func: fn(Vec<String>) -> i32, func_args: Vec<String>) -> i32
 {
-    FUNC_HOLDER = unsafe { Some(func) };
+    unsafe { FUNC_HOLDER = Some(func) };
     let str_args: Vec<&str> = func_args
         .iter()
         .map(|s| s.as_str())