diff --git a/libcxx/test/std/algorithms/alg.modifying.operations/alg.transform/ranges.transform.pass.cpp b/libcxx/test/std/algorithms/alg.modifying.operations/alg.transform/ranges.transform.pass.cpp
--- a/libcxx/test/std/algorithms/alg.modifying.operations/alg.transform/ranges.transform.pass.cpp
+++ b/libcxx/test/std/algorithms/alg.modifying.operations/alg.transform/ranges.transform.pass.cpp
@@ -8,6 +8,8 @@
 
 // UNSUPPORTED: c++03, c++11, c++14, c++17
 // UNSUPPORTED: libcpp-has-no-incomplete-ranges
+// On AIX the test takes a long time, leading to frequent CI timeouts.
+// UNSUPPORTED: LIBCXX-AIX-FIXME
 
 // <algorithm>