diff --git a/cmake/ConfigureChecks.cmake b/cmake/ConfigureChecks.cmake
index 69dbb17b0..59d48140e 100644
--- a/cmake/ConfigureChecks.cmake
+++ b/cmake/ConfigureChecks.cmake
@@ -191,10 +191,10 @@ FIND_PROGRAM(SED sed)
 # https://github.com/fish-shell/fish-shell/issues/5865
 CHECK_CXX_SOURCE_COMPILES("
 #include <atomic>
-struct big { int foo[64]; };
-std::atomic<big> x;
+#include <cstdint>
+std::atomic<uint64_t> x;
 int main() {
-   return x.load().foo[13];
+   return x;
 }"
 LIBATOMIC_NOT_NEEDED)
 IF (NOT LIBATOMIC_NOT_NEEDED)