diff --git a/llvm/include/llvm/Support/Threading.h b/llvm/include/llvm/Support/Threading.h
index 387bf5e1b941..09b96dfb4c1c 100644
--- a/llvm/include/llvm/Support/Threading.h
+++ b/llvm/include/llvm/Support/Threading.h
@@ -23,7 +23,8 @@
 // We use std::call_once on all Unix platforms except for NetBSD with
 // libstdc++. That platform has a bug they are working to fix, and they'll
 // remove the NetBSD checks once fixed.
-#if defined(LLVM_ON_UNIX) && !(defined(__NetBSD__) && !defined(_LIBCPP_VERSION))
+#if defined(LLVM_ON_UNIX) &&                                                   \
+    !(defined(__NetBSD__) && !defined(_LIBCPP_VERSION)) && !defined(__ppc__)
 #define LLVM_THREADING_USE_STD_CALL_ONCE 1
 #else
 #define LLVM_THREADING_USE_STD_CALL_ONCE 0