diff --git a/balloon-hash/src/balloon.rs b/balloon-hash/src/balloon.rs
index c2c11b2f..e38981c5 100644
--- a/balloon-hash/src/balloon.rs
+++ b/balloon-hash/src/balloon.rs
@@ -49,7 +49,7 @@ where
     let output_xor = {
         use rayon::iter::{ParallelBridge, ParallelIterator};
 
-        if memory_blocks.len() < (params.s_cost.get() * params.p_cost.get()) as usize {
+        if memory_blocks.len() < params.s_cost.get() as usize * params.p_cost.get() as usize {
             return Err(Error::MemoryTooLittle);
         }
 
diff --git a/balloon-hash/src/lib.rs b/balloon-hash/src/lib.rs
index 6e634102..c4de5cda 100644
--- a/balloon-hash/src/lib.rs
+++ b/balloon-hash/src/lib.rs
@@ -132,7 +132,7 @@ where
         #[cfg(not(feature = "parallel"))]
         let mut memory = alloc::vec![Array::default(); self.params.s_cost.get() as usize];
         #[cfg(feature = "parallel")]
-        let mut memory = alloc::vec![Array::default(); (self.params.s_cost.get() * self.params.p_cost.get()) as usize];
+        let mut memory = alloc::vec![Array::default(); self.params.s_cost.get() as usize * self.params.p_cost.get() as usize];
 
         self.hash_password_into_with_memory(pwd, salt, &mut memory, output)?;
         #[cfg(feature = "zeroize")]