diff --git a/library/core/src/fmt/num.rs b/library/core/src/fmt/num.rs
index cc94c392de5..0f33d730a68 100644
--- a/library/core/src/fmt/num.rs
+++ b/library/core/src/fmt/num.rs
@@ -167,7 +167,8 @@ integer! { i16, u16 }
 integer! { i32, u32 }
 integer! { i64, u64 }
 integer! { i128, u128 }
-macro_rules! debug {
+
+macro_rules! impl_Debug {
     ($($T:ident)*) => {$(
         #[stable(feature = "rust1", since = "1.0.0")]
         impl fmt::Debug for $T {
@@ -184,10 +185,6 @@ macro_rules! debug {
         }
     )*};
 }
-debug! {
-  i8 i16 i32 i64 i128 isize
-  u8 u16 u32 u64 u128 usize
-}
 
 // 2 digit decimal look up table
 static DEC_DIGITS_LUT: &[u8; 200] = b"0001020304050607080910111213141516171819\
@@ -510,6 +507,11 @@ macro_rules! impl_Exp {
     };
 }
 
+impl_Debug! {
+  i8 i16 i32 i64 i128 isize
+  u8 u16 u32 u64 u128 usize
+}
+
 // Include wasm32 in here since it doesn't reflect the native pointer size, and
 // often cares strongly about getting a smaller code size.
 #[cfg(any(target_pointer_width = "64", target_arch = "wasm32"))]