diff --git a/llvm/lib/Support/ProgramStack.cpp b/llvm/lib/Support/ProgramStack.cpp
index 66f74ff660b20..1c90e523c559b 100644
--- a/llvm/lib/Support/ProgramStack.cpp
+++ b/llvm/lib/Support/ProgramStack.cpp
@@ -20,6 +20,8 @@
 
 #ifndef LLVM_HAS_SPLIT_STACKS
 # include "llvm/Support/thread.h"
+#else
+# include <stdlib.h> // for malloc
 #endif
 
 using namespace llvm;