diff --git a/newlib/libc/include/machine/ieeefp.h b/newlib/libc/include/machine/ieeefp.h
index 4dc13828c..3c1f41e03 100644
--- a/newlib/libc/include/machine/ieeefp.h
+++ b/newlib/libc/include/machine/ieeefp.h
@@ -199,7 +199,11 @@
 #endif
 
 #ifdef __riscv
+#if defined(__BYTE_ORDER__) && (__BYTE_ORDER__ == __ORDER_BIG_ENDIAN__)
+#define __IEEE_BIG_ENDIAN
+#else
 #define __IEEE_LITTLE_ENDIAN
+#endif
 #ifdef __riscv_flen
 # define _SUPPORTS_ERREXCEPT
 #endif