diff --git a/libm/mips/fenv.c b/libm/mips/fenv.c
index 893bc30..aacd526 100644
--- a/libm/mips/fenv.c
+++ b/libm/mips/fenv.c
@@ -28,6 +28,12 @@
 
 #include <fenv.h>
 
+#define FCSR_CAUSE_SHIFT 10
+#define FCSR_ENABLE_SHIFT 5
+#define FCSR_ENABLE_MASK (FE_ALL_EXCEPT << FCSR_ENABLE_SHIFT)
+
+#define FCSR_RMASK       0x3
+
 /*
  * Hopefully the system ID byte is immutable, so it's valid to use
  * this as a default environment.
@@ -55,7 +61,7 @@
   fexcept_t __fcsr;
   fegetenv(&__fcsr);
   __excepts &= FE_ALL_EXCEPT;
-  __fcsr &= ~(__excepts | (__excepts << _FCSR_CAUSE_SHIFT));
+  __fcsr &= ~(__excepts | (__excepts << FCSR_CAUSE_SHIFT));
   fesetenv(&__fcsr);
   return 0;
 }
@@ -84,7 +90,7 @@
   /* Ensure that flags are all legal */
   __excepts &= FE_ALL_EXCEPT;
   /* Cause bit needs to be set as well for generating the exception*/
-  __fcsr |= __excepts | (__excepts << _FCSR_CAUSE_SHIFT);
+  __fcsr |= __excepts | (__excepts << FCSR_CAUSE_SHIFT);
   fesetenv(&__fcsr);
   return 0;
 }
@@ -98,14 +104,14 @@
 int fegetround(void) {
   fenv_t _fcsr;
   fegetenv(&_fcsr);
-  return (_fcsr & _FCSR_RMASK);
+  return (_fcsr & FCSR_RMASK);
 }
 
 int fesetround(int __round) {
   fenv_t _fcsr;
   fegetenv(&_fcsr);
-  _fcsr &= ~_FCSR_RMASK;
-  _fcsr |= (__round & _FCSR_RMASK ) ;
+  _fcsr &= ~FCSR_RMASK;
+  _fcsr |= (__round & FCSR_RMASK);
   fesetenv(&_fcsr);
   return 0;
 }
@@ -114,7 +120,7 @@
   fenv_t __env;
   fegetenv(&__env);
   *__envp = __env;
-  __env &= ~(FE_ALL_EXCEPT | _FCSR_ENABLE_MASK);
+  __env &= ~(FE_ALL_EXCEPT | FCSR_ENABLE_MASK);
   fesetenv(&__env);
   return 0;
 }
@@ -130,21 +136,21 @@
 int feenableexcept(int __mask) {
   fenv_t __old_fcsr, __new_fcsr;
   fegetenv(&__old_fcsr);
-  __new_fcsr = __old_fcsr | (__mask & FE_ALL_EXCEPT) << _ENABLE_SHIFT;
+  __new_fcsr = __old_fcsr | (__mask & FE_ALL_EXCEPT) << FCSR_ENABLE_SHIFT;
   fesetenv(&__new_fcsr);
-  return ((__old_fcsr >> _ENABLE_SHIFT) & FE_ALL_EXCEPT);
+  return ((__old_fcsr >> FCSR_ENABLE_SHIFT) & FE_ALL_EXCEPT);
 }
 
 int fedisableexcept(int __mask) {
   fenv_t __old_fcsr, __new_fcsr;
   fegetenv(&__old_fcsr);
-  __new_fcsr = __old_fcsr & ~((__mask & FE_ALL_EXCEPT) << _ENABLE_SHIFT);
+  __new_fcsr = __old_fcsr & ~((__mask & FE_ALL_EXCEPT) << FCSR_ENABLE_SHIFT);
   fesetenv(&__new_fcsr);
-  return ((__old_fcsr >> _ENABLE_SHIFT) & FE_ALL_EXCEPT);
+  return ((__old_fcsr >> FCSR_ENABLE_SHIFT) & FE_ALL_EXCEPT);
 }
 
 int fegetexcept(void) {
   fenv_t __fcsr;
   fegetenv(&__fcsr);
-  return ((__fcsr & _FCSR_ENABLE_MASK) >> _ENABLE_SHIFT);
+  return ((__fcsr & FCSR_ENABLE_MASK) >> FCSR_ENABLE_SHIFT);
 }