diff --git a/compiler-rt/test/asan/TestCases/alloca_constant_size.cc b/compiler-rt/test/asan/TestCases/alloca_constant_size.cc
index 61f6da710116..a766ae75be07 100644
--- a/compiler-rt/test/asan/TestCases/alloca_constant_size.cc
+++ b/compiler-rt/test/asan/TestCases/alloca_constant_size.cc
@@ -10,6 +10,8 @@
 // MSVC provides _alloca instead of alloca.
 #if defined(_MSC_VER) && !defined(alloca)
 # define alloca _alloca
+#elif defined(__FreeBSD__)
+#include <stdlib.h>
 #else
 #include <alloca.h>
 #endif