diff --git a/compiler-rt/test/ubsan/TestCases/Float/cast-overflow.cpp b/compiler-rt/test/ubsan/TestCases/Float/cast-overflow.cpp
index 05cd7568349a..22991e0a6c55 100644
--- a/compiler-rt/test/ubsan/TestCases/Float/cast-overflow.cpp
+++ b/compiler-rt/test/ubsan/TestCases/Float/cast-overflow.cpp
@@ -20,6 +20,11 @@
 # define BYTE_ORDER __DARWIN_BYTE_ORDER
 # define BIG_ENDIAN __DARWIN_BIG_ENDIAN
 # define LITTLE_ENDIAN __DARWIN_LITTLE_ENDIAN
+#elif defined(__FreeBSD__)
+# include <sys/endian.h>
+# define BYTE_ORDER _BYTE_ORDER
+# define BIG_ENDIAN _BIG_ENDIAN
+# define LITTLE_ENDIAN _LITTLE_ENDIAN
 #else
 # include <endian.h>
 # define BYTE_ORDER __BYTE_ORDER