diff --git a/src/macros.rs b/src/macros.rs
index 1c0fbf9b3675..edc391e079be 100644
--- a/src/macros.rs
+++ b/src/macros.rs
@@ -199,7 +199,7 @@ macro_rules! e {
 // cfg completely.
 // FIXME(ctest): ctest can't handle `$(,)?` so we use `$(,)*` which isn't quite correct.
 cfg_if! {
-    if #[cfg(any())] {
+    if #[cfg(all())] {
     // if #[cfg(feature = "const-extern-fn")] {
         /// Define an `unsafe` function that is const as long as `const-extern-fn` is enabled.
         macro_rules! f {