diff --git a/Cargo.toml b/Cargo.toml
index e70f7a0..8e4133a 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -1,3 +1,5 @@
+cargo-features = ["profile-rustflags"]
+
 [package]
 name = "shush"
 version = "0.1.0"
diff --git a/src/lib.rs b/src/lib.rs
index 69fa8c9..01d6c89 100644
--- a/src/lib.rs
+++ b/src/lib.rs
@@ -44,11 +44,13 @@ impl<S: Zeroize> Drop for SecretBox<S> {
 
         #[cfg(unix)]
         {
-            let page_size = unsafe { sysconf(_SC_PAGESIZE) } as usize;
+            let page_size = unsafe { sysconf(_SC_PAGESIZE) };
 
             if page_size == -1 {
                 panic!("Error getting page size: \n{}", errno())
             }
+
+            let page_size = page_size as usize;
             // Align the address and size to the page boundary
             let start = (secret_ptr as usize) & !(page_size - 1);
             let end = ((secret_ptr as usize) + len + page_size - 1) & !(page_size - 1);
@@ -94,11 +96,13 @@ impl<S: Zeroize> SecretBox<S> {
 
         #[cfg(unix)]
         {
-            let page_size = unsafe { sysconf(_SC_PAGESIZE) } as usize;
+            let page_size = unsafe { sysconf(_SC_PAGESIZE) };
             if page_size == -1 {
                 panic!("Error getting page size: \n{}", errno())
             }
 
+            let page_size = page_size as usize;
+
             // Align the address and size to the page boundary
             let start = (secret_ptr as usize) & !(page_size - 1);
             let end = ((secret_ptr as usize) + len + page_size - 1) & !(page_size - 1);