diff --git a/compiler-rt/test/profile/Posix/instrprof-dlopen-dlclose-gcov.test b/compiler-rt/test/profile/Posix/instrprof-dlopen-dlclose-gcov.test
index b845303a8afdcc..cdbc42e1fc0924 100644
--- a/compiler-rt/test/profile/Posix/instrprof-dlopen-dlclose-gcov.test
+++ b/compiler-rt/test/profile/Posix/instrprof-dlopen-dlclose-gcov.test
@@ -1,3 +1,4 @@
+UNSUPPORTED: host-byteorder-big-endian
 # atexit(3) not supported in dlopen(3)ed+dlclose(3)d DSO
 XFAIL: netbsd
 
diff --git a/compiler-rt/test/profile/Posix/instrprof-shared-gcov-flush.test b/compiler-rt/test/profile/Posix/instrprof-shared-gcov-flush.test
index 8d530fd452a7b2..d832f0b1f66a0a 100644
--- a/compiler-rt/test/profile/Posix/instrprof-shared-gcov-flush.test
+++ b/compiler-rt/test/profile/Posix/instrprof-shared-gcov-flush.test
@@ -1,3 +1,4 @@
+UNSUPPORTED: host-byteorder-big-endian
 # This test fails on Mac (https://bugs.llvm.org/show_bug.cgi?id=38134)
 XFAIL: darwin