diff --git a/openmp/runtime/test/tasking/hidden_helper_task/capacity_mix_threads.cpp b/openmp/runtime/test/tasking/hidden_helper_task/capacity_mix_threads.cpp
index 776aee9d8e2ca..3f2ceef0c4add 100644
--- a/openmp/runtime/test/tasking/hidden_helper_task/capacity_mix_threads.cpp
+++ b/openmp/runtime/test/tasking/hidden_helper_task/capacity_mix_threads.cpp
@@ -1,4 +1,7 @@
 // RUN: %libomp-cxx-compile-and-run
+//
+// AIX runs out of resource in 32-bit with 4*omp_get_max_threads() threads.
+// XFAIL: aix && ppc
 
 #include <omp.h>
 
diff --git a/openmp/runtime/test/tasking/hidden_helper_task/capacity_nthreads.cpp b/openmp/runtime/test/tasking/hidden_helper_task/capacity_nthreads.cpp
index b551318a72f3f..f7405d00255cb 100644
--- a/openmp/runtime/test/tasking/hidden_helper_task/capacity_nthreads.cpp
+++ b/openmp/runtime/test/tasking/hidden_helper_task/capacity_nthreads.cpp
@@ -1,4 +1,7 @@
 // RUN: %libomp-cxx-compile-and-run
+//
+// AIX runs out of resource in 32-bit with 4*omp_get_max_threads() threads.
+// XFAIL: aix && ppc
 
 #include <omp.h>