Index: test/sanitizer_common/TestCases/Linux/sem_init_glibc.cc
===================================================================
--- test/sanitizer_common/TestCases/Linux/sem_init_glibc.cc
+++ test/sanitizer_common/TestCases/Linux/sem_init_glibc.cc
@@ -8,8 +8,12 @@
 #include <string.h>
 #include <stdint.h>
 
+// On powerpc64be semval_t must be 64 bits even with "old" versions of glibc.
+#if __PPC64__ && __BIG_ENDIAN__
+typedef uint64_t semval_t;
+
 // This condition needs to correspond to __HAVE_64B_ATOMICS macro in glibc.
-#if (defined(__x86_64__) || defined(__aarch64__) || defined(__powerpc64__) || \
+#elif (defined(__x86_64__) || defined(__aarch64__) || defined(__powerpc64__) || \
      defined(__s390x__) || defined(__sparc64__) || defined(__alpha__) || \
      defined(__ia64__) || defined(__m68k__)) && __GLIBC_PREREQ(2, 21)
 typedef uint64_t semval_t;