diff --git a/crates/core_arch/src/wasm32/atomic.rs b/crates/core_arch/src/wasm32/atomic.rs
index cdd2302d7f..fdc8cfbfdb 100644
--- a/crates/core_arch/src/wasm32/atomic.rs
+++ b/crates/core_arch/src/wasm32/atomic.rs
@@ -1,7 +1,7 @@
 #[cfg(test)]
 use stdarch_test::assert_instr;
 
-unsafe extern "C" {
+unsafe extern "unadjusted" {
     #[link_name = "llvm.wasm.memory.atomic.wait32"]
     fn llvm_atomic_wait_i32(ptr: *mut i32, exp: i32, timeout: i64) -> i32;
     #[link_name = "llvm.wasm.memory.atomic.wait64"]
diff --git a/crates/core_arch/src/wasm32/memory.rs b/crates/core_arch/src/wasm32/memory.rs
index 348add286a..90e9075e51 100644
--- a/crates/core_arch/src/wasm32/memory.rs
+++ b/crates/core_arch/src/wasm32/memory.rs
@@ -1,7 +1,7 @@
 #[cfg(test)]
 use stdarch_test::assert_instr;
 
-unsafe extern "C" {
+unsafe extern "unadjusted" {
     #[link_name = "llvm.wasm.memory.grow"]
     fn llvm_memory_grow(mem: u32, pages: usize) -> usize;
     #[link_name = "llvm.wasm.memory.size"]
diff --git a/crates/core_arch/src/wasm32/relaxed_simd.rs b/crates/core_arch/src/wasm32/relaxed_simd.rs
index 1a15f581b3..a9b7e9c04d 100644
--- a/crates/core_arch/src/wasm32/relaxed_simd.rs
+++ b/crates/core_arch/src/wasm32/relaxed_simd.rs
@@ -5,7 +5,7 @@ use crate::core_arch::simd;
 use stdarch_test::assert_instr;
 
 #[allow(improper_ctypes)]
-unsafe extern "C" {
+unsafe extern "unadjusted" {
     #[link_name = "llvm.wasm.relaxed.swizzle"]
     fn llvm_relaxed_swizzle(a: simd::i8x16, b: simd::i8x16) -> simd::i8x16;
     #[link_name = "llvm.wasm.relaxed.trunc.signed"]
diff --git a/crates/core_arch/src/wasm32/simd128.rs b/crates/core_arch/src/wasm32/simd128.rs
index 1a1e7dc780..96fb246068 100644
--- a/crates/core_arch/src/wasm32/simd128.rs
+++ b/crates/core_arch/src/wasm32/simd128.rs
@@ -73,7 +73,7 @@ conversions! {
 }
 
 #[allow(improper_ctypes)]
-unsafe extern "C" {
+unsafe extern "unadjusted" {
     #[link_name = "llvm.wasm.swizzle"]
     fn llvm_swizzle(a: simd::i8x16, b: simd::i8x16) -> simd::i8x16;