diff --git a/src/shims/intrinsics/simd.rs b/src/shims/intrinsics/simd.rs
index af98b38af8..6973c0e9c3 100644
--- a/src/shims/intrinsics/simd.rs
+++ b/src/shims/intrinsics/simd.rs
@@ -457,7 +457,7 @@ pub trait EvalContextExt<'mir, 'tcx: 'mir>: crate::MiriInterpCxExt<'mir, 'tcx> {
                 let bitmask_len = u32::try_from(bitmask_len).unwrap();
 
                 // To read the mask, we transmute it to an integer.
-                // That does the right thing wrt endianess.
+                // That does the right thing wrt endianness.
                 let mask_ty = this.machine.layouts.uint(mask.layout.size).unwrap();
                 let mask = mask.transmute(mask_ty, this)?;
                 let mask: u64 = this.read_scalar(&mask)?.to_bits(mask_ty.size)?.try_into().unwrap();
@@ -509,7 +509,7 @@ pub trait EvalContextExt<'mir, 'tcx: 'mir>: crate::MiriInterpCxExt<'mir, 'tcx> {
                     }
                 }
                 // We have to change the type of the place to be able to write `res` into it. This
-                // transmutes the integer to an array, which does the right thing wrt endianess.
+                // transmutes the integer to an array, which does the right thing wrt endianness.
                 let dest =
                     dest.transmute(this.machine.layouts.uint(dest.layout.size).unwrap(), this)?;
                 this.write_int(res, &dest)?;
diff --git a/src/shims/unix/linux/fd/event.rs b/src/shims/unix/linux/fd/event.rs
index 1f17ffb88c..49408fda3a 100644
--- a/src/shims/unix/linux/fd/event.rs
+++ b/src/shims/unix/linux/fd/event.rs
@@ -38,7 +38,7 @@ impl FileDescriptor for Event {
     }
 
     /// A write call adds the 8-byte integer value supplied in
-    /// its buffer (in native endianess) to the counter.  The maximum value that may be
+    /// its buffer (in native endianness) to the counter.  The maximum value that may be
     /// stored in the counter is the largest unsigned 64-bit value
     /// minus 1 (i.e., 0xfffffffffffffffe).  If the addition would
     /// cause the counter's value to exceed the maximum, then the
@@ -57,7 +57,7 @@ impl FileDescriptor for Event {
     ) -> InterpResult<'tcx, io::Result<usize>> {
         let v1 = self.val.get();
         let bytes: [u8; 8] = bytes.try_into().unwrap(); // FIXME fail gracefully when this has the wrong size
-        // Convert from target endianess to host endianess.
+        // Convert from target endianness to host endianness.
         let num = match tcx.sess.target.endian {
             Endian::Little => u64::from_le_bytes(bytes),
             Endian::Big => u64::from_be_bytes(bytes),