diff --git a/compiler-rt/test/msan/__strxfrm_l.cpp b/compiler-rt/test/msan/__strxfrm_l.cpp
--- a/compiler-rt/test/msan/__strxfrm_l.cpp
+++ b/compiler-rt/test/msan/__strxfrm_l.cpp
@@ -10,7 +10,7 @@
 extern "C" decltype(strxfrm_l) __strxfrm_l;
 
 int main(void) {
-  char q[10];
+  char q[100];
   locale_t loc = newlocale(LC_ALL_MASK, "", (locale_t)0);
   size_t n = __strxfrm_l(q, "qwerty", sizeof(q), loc);
   assert(n < sizeof(q));
diff --git a/compiler-rt/test/msan/strxfrm.cpp b/compiler-rt/test/msan/strxfrm.cpp
--- a/compiler-rt/test/msan/strxfrm.cpp
+++ b/compiler-rt/test/msan/strxfrm.cpp
@@ -7,7 +7,7 @@
 #include <string.h>
 
 int main(void) {
-  char q[10];
+  char q[100];
   size_t n = strxfrm(q, "abcdef", sizeof(q));
   assert(n < sizeof(q));
   __msan_check_mem_is_initialized(q, n + 1);
diff --git a/compiler-rt/test/sanitizer_common/TestCases/Posix/strxfrm.c b/compiler-rt/test/sanitizer_common/TestCases/Posix/strxfrm.c
--- a/compiler-rt/test/sanitizer_common/TestCases/Posix/strxfrm.c
+++ b/compiler-rt/test/sanitizer_common/TestCases/Posix/strxfrm.c
@@ -3,16 +3,16 @@
 
 #include <assert.h>
 #include <locale.h>
-#include <wchar.h>
+#include <string.h>
 
 int main(int argc, char **argv) {
   char q[10];
   size_t n = strxfrm(q, "abcdef", sizeof(q));
   assert(n < sizeof(q));
 
-  char q2[10];
+  char q2[100];
   locale_t loc = newlocale(LC_ALL_MASK, "", (locale_t)0);
-  n = strxfrm_l(q2, L"qwerty", sizeof(q), loc);
+  n = strxfrm_l(q2, "qwerty", sizeof(q2), loc);
   assert(n < sizeof(q2));
 
   freelocale(loc);