diff --git a/library/core/src/fmt/num.rs b/library/core/src/fmt/num.rs
index 778515f8616c4..ab2158394bf1e 100644
--- a/library/core/src/fmt/num.rs
+++ b/library/core/src/fmt/num.rs
@@ -15,7 +15,7 @@ trait DisplayInt:
     fn zero() -> Self;
     fn from_u8(u: u8) -> Self;
     fn to_u8(&self) -> u8;
-    fn to_u16(&self) -> u16;
+    #[cfg(not(any(target_pointer_width = "64", target_arch = "wasm32")))]
     fn to_u32(&self) -> u32;
     fn to_u64(&self) -> u64;
     fn to_u128(&self) -> u128;
@@ -27,7 +27,7 @@ macro_rules! impl_int {
           fn zero() -> Self { 0 }
           fn from_u8(u: u8) -> Self { u as Self }
           fn to_u8(&self) -> u8 { *self as u8 }
-          fn to_u16(&self) -> u16 { *self as u16 }
+          #[cfg(not(any(target_pointer_width = "64", target_arch = "wasm32")))]
           fn to_u32(&self) -> u32 { *self as u32 }
           fn to_u64(&self) -> u64 { *self as u64 }
           fn to_u128(&self) -> u128 { *self as u128 }
@@ -40,7 +40,7 @@ macro_rules! impl_uint {
           fn zero() -> Self { 0 }
           fn from_u8(u: u8) -> Self { u as Self }
           fn to_u8(&self) -> u8 { *self as u8 }
-          fn to_u16(&self) -> u16 { *self as u16 }
+          #[cfg(not(any(target_pointer_width = "64", target_arch = "wasm32")))]
           fn to_u32(&self) -> u32 { *self as u32 }
           fn to_u64(&self) -> u64 { *self as u64 }
           fn to_u128(&self) -> u128 { *self as u128 }