diff --git a/src/shims/intrinsics/mod.rs b/src/shims/intrinsics/mod.rs
index e34fb118f7..df2761bfaf 100644
--- a/src/shims/intrinsics/mod.rs
+++ b/src/shims/intrinsics/mod.rs
@@ -108,12 +108,12 @@ pub trait EvalContextExt<'mir, 'tcx: 'mir>: crate::MiriInterpCxExt<'mir, 'tcx> {
             "volatile_load" => {
                 let [place] = check_arg_count(args)?;
                 let place = this.deref_pointer(place)?;
-                this.copy_op(&place, dest, /*allow_transmute*/ false)?;
+                this.copy_op(&place, dest)?;
             }
             "volatile_store" => {
                 let [place, dest] = check_arg_count(args)?;
                 let place = this.deref_pointer(place)?;
-                this.copy_op(dest, &place, /*allow_transmute*/ false)?;
+                this.copy_op(dest, &place)?;
             }
 
             "write_bytes" | "volatile_set_memory" => {
diff --git a/src/shims/x86/mod.rs b/src/shims/x86/mod.rs
index 1aaf820f46..b24ea8aec8 100644
--- a/src/shims/x86/mod.rs
+++ b/src/shims/x86/mod.rs
@@ -299,7 +299,6 @@ fn bin_op_simd_float_first<'tcx, F: rustc_apfloat::Float>(
         this.copy_op(
             &this.project_index(&left, i)?,
             &this.project_index(&dest, i)?,
-            /*allow_transmute*/ false,
         )?;
     }
 
@@ -424,7 +423,6 @@ fn unary_op_ss<'tcx>(
         this.copy_op(
             &this.project_index(&op, i)?,
             &this.project_index(&dest, i)?,
-            /*allow_transmute*/ false,
         )?;
     }
 
@@ -484,7 +482,6 @@ fn round_first<'tcx, F: rustc_apfloat::Float>(
         this.copy_op(
             &this.project_index(&left, i)?,
             &this.project_index(&dest, i)?,
-            /*allow_transmute*/ false,
         )?;
     }
 
diff --git a/src/shims/x86/sse.rs b/src/shims/x86/sse.rs
index 1e9afc1e9e..9fb947cb2a 100644
--- a/src/shims/x86/sse.rs
+++ b/src/shims/x86/sse.rs
@@ -211,7 +211,6 @@ pub(super) trait EvalContextExt<'mir, 'tcx: 'mir>:
                     this.copy_op(
                         &this.project_index(&left, i)?,
                         &this.project_index(&dest, i)?,
-                        /*allow_transmute*/ false,
                     )?;
                 }
             }
diff --git a/src/shims/x86/sse2.rs b/src/shims/x86/sse2.rs
index 49bf7547ab..e5c8267320 100644
--- a/src/shims/x86/sse2.rs
+++ b/src/shims/x86/sse2.rs
@@ -443,7 +443,6 @@ pub(super) trait EvalContextExt<'mir, 'tcx: 'mir>:
                     this.copy_op(
                         &this.project_index(&op, i)?,
                         &this.project_index(&dest, i)?,
-                        /*allow_transmute*/ false,
                     )?;
                 }
             }
@@ -584,7 +583,6 @@ pub(super) trait EvalContextExt<'mir, 'tcx: 'mir>:
                     this.copy_op(
                         &this.project_index(&left, i)?,
                         &this.project_index(&dest, i)?,
-                        /*allow_transmute*/ false,
                     )?;
                 }
             }
diff --git a/src/shims/x86/sse41.rs b/src/shims/x86/sse41.rs
index 67bb63f0a3..2abd10fa7a 100644
--- a/src/shims/x86/sse41.rs
+++ b/src/shims/x86/sse41.rs
@@ -60,7 +60,6 @@ pub(super) trait EvalContextExt<'mir, 'tcx: 'mir>:
                         this.copy_op(
                             &this.project_index(&left, i)?,
                             &dest,
-                            /*allow_transmute*/ false,
                         )?;
                     }
                 }