diff --git a/newlib/libc/machine/aarch64/sys/fenv.h b/newlib/libc/machine/aarch64/sys/fenv.h
index 212612725..0e4e7f492 100644
--- a/newlib/libc/machine/aarch64/sys/fenv.h
+++ b/newlib/libc/machine/aarch64/sys/fenv.h
@@ -61,7 +61,14 @@ typedef	__uint64_t	fexcept_t;
 			 FE_UPWARD | FE_TOWARDZERO)
 #define	_ROUND_SHIFT	22
 
-
+/* Only Solaris and QNX implement fegetprec/fesetprec.  As Solaris, use the
+   values defined by http://www.open-std.org/jtc1/sc22//WG14/www/docs/n752.htm
+   QNX defines different values. */
+#if __MISC_VISIBLE
+#define FE_FLTPREC	(0)
+#define FE_DBLPREC	(2)
+#define FE_LDBLPREC	(3)
+#endif
 
 /* Default floating-point environment */
 extern const fenv_t	*_fe_dfl_env;
@@ -115,6 +122,21 @@ fegetexcept(void)
 
 #endif /* __BSD_VISIBLE */
 
+#ifdef __cplusplus
+extern "C" {
+#endif
 
+#ifdef __CYGWIN__
+
+#if __MISC_VISIBLE
+int fegetprec (void);
+int fesetprec (int __prec);
+#endif
+
+#endif /* __CYGWIN__ */
+
+#ifdef __cplusplus
+}
+#endif
 
 #endif	/* !_FENV_H_ */
diff --git a/newlib/libm/machine/aarch64/fenv.c b/newlib/libm/machine/aarch64/fenv.c
index 3ffe23441..3f3459e9d 100644
--- a/newlib/libm/machine/aarch64/fenv.c
+++ b/newlib/libm/machine/aarch64/fenv.c
@@ -55,3 +55,33 @@ extern inline int feupdateenv(const fenv_t *__envp);
 extern inline int feenableexcept(int __mask);
 extern inline int fedisableexcept(int __mask);
 extern inline int fegetexcept(void);
+
+#if defined(__CYGWIN__)
+
+/* Returns the currently selected precision, represented by one of the
+   values of the defined precision macros. */
+int
+fegetprec (void)
+{
+  /* AArch64 doesn't have configurable precision.
+     Return a fixed value indicating double precision (most common). */
+  return FE_DBLPREC;
+}
+
+/* http://www.open-std.org/jtc1/sc22//WG14/www/docs/n752.htm:
+
+   The fesetprec function establishes the precision represented by its
+   argument prec.  If the argument does not match a precision macro, the
+   precision is not changed.
+
+   The fesetprec function returns a nonzero value if and only if the
+   argument matches a precision macro (that is, if and only if the requested
+   precision can be established). */
+int
+fesetprec (int prec)
+{
+  /* Aarch64 doesn't support changing precision at runtime. */
+  return 0; // return failure
+}
+
+#endif