diff --git a/library/core/src/ptr/mod.rs b/library/core/src/ptr/mod.rs
index caa279f0de579..62548b5fadd2e 100644
--- a/library/core/src/ptr/mod.rs
+++ b/library/core/src/ptr/mod.rs
@@ -1938,7 +1938,7 @@ macro_rules! fnptr_impls_args {
 }
 
 fnptr_impls_args! {}
-fnptr_impls_args! { A }
+fnptr_impls_args! { T }
 fnptr_impls_args! { A, B }
 fnptr_impls_args! { A, B, C }
 fnptr_impls_args! { A, B, C, D }