diff --git a/newlib/libc/machine/riscv/sys/fenv.h b/newlib/libc/machine/riscv/sys/fenv.h
index 6cbd321f3..772f3833f 100644
--- a/newlib/libc/machine/riscv/sys/fenv.h
+++ b/newlib/libc/machine/riscv/sys/fenv.h
@@ -14,6 +14,8 @@
 
 #include <stddef.h>
 
+#if __riscv_flen
+
 /* Per "The RISC-V Instruction Set Manual: Volume I: User-Level ISA:
  * Version 2.1", Section 8.2, "Floating-Point Control and Status
  * Register":
@@ -69,6 +71,13 @@
  * floating-point unit."
  */
 
+#else /* !__riscv_flen */
+
+#define FE_ALL_EXCEPT   0x00000000
+#define FE_TONEAREST    0x00000000
+
+#endif /* !__riscv_flen */
+
 typedef size_t fenv_t;
 typedef size_t fexcept_t;
 extern const fenv_t fe_dfl_env;