diff --git a/crates/wiggle/crates/runtime/src/guest_type.rs b/crates/wiggle/crates/runtime/src/guest_type.rs
index 1a654da17e..534eed5489 100644
--- a/crates/wiggle/crates/runtime/src/guest_type.rs
+++ b/crates/wiggle/crates/runtime/src/guest_type.rs
@@ -108,9 +108,9 @@ macro_rules! primitives {
 
 primitives! {
     // signed
-    i8 i16 i32 i64 i128 isize
+    i8 i16 i32 i64 i128
     // unsigned
-    u8 u16 u32 u64 u128 usize
+    u8 u16 u32 u64 u128
     // floats
     f32 f64
 }