diff --git a/libm/arm/fenv.h b/libm/arm/fenv.h
index 893a59664..534b12cbd 100644
--- a/libm/arm/fenv.h
+++ b/libm/arm/fenv.h
@@ -31,6 +31,8 @@
 
 #include <sys/types.h>
 
+__BEGIN_DECLS
+
 typedef	uint32_t	fenv_t;
 typedef	uint32_t	fexcept_t;
 
@@ -50,7 +52,6 @@ typedef	uint32_t	fexcept_t;
 #define	FE_DOWNWARD	0x0003
 #define	_ROUND_MASK	(FE_TONEAREST | FE_DOWNWARD | \
 			 FE_UPWARD | FE_TOWARDZERO)
-/* __BEGIN_DECLS */
 
 /* Default floating-point environment */
 extern const fenv_t	__fe_dfl_env;
@@ -212,6 +213,6 @@ fegetexcept(void)
 
 #endif /* __BSD_VISIBLE */
 
-/* __END_DECLS */
+__END_DECLS
 
 #endif	/* !_FENV_H_ */
diff --git a/libm/include/i387/fenv.h b/libm/include/i387/fenv.h
index 710494c00..4e322b76d 100644
--- a/libm/include/i387/fenv.h
+++ b/libm/include/i387/fenv.h
@@ -32,6 +32,8 @@
 #include <sys/cdefs.h>
 #include <sys/_types.h>
 
+__BEGIN_DECLS
+
 /*                   
  * To preserve binary compatibility with FreeBSD 5.3, we pack the
  * mxcsr into some reserved fields, rather than changing sizeof(fenv_t).
@@ -65,8 +67,6 @@ typedef	__uint16_t	fexcept_t;
 #define	_ROUND_MASK	(FE_TONEAREST | FE_DOWNWARD | \
 			 FE_UPWARD | FE_TOWARDZERO)
 
-__BEGIN_DECLS
-
 /* Default floating-point environment */
 extern const fenv_t	__fe_dfl_env;
 #define	FE_DFL_ENV	(&__fe_dfl_env)
diff --git a/libm/mips/fenv.h b/libm/mips/fenv.h
index 061a69620..583d0022f 100644
--- a/libm/mips/fenv.h
+++ b/libm/mips/fenv.h
@@ -29,8 +29,11 @@
 #ifndef	_FENV_H_
 #define	_FENV_H_
 
+#include <sys/cdefs.h>
 #include <sys/_types.h>
 
+__BEGIN_DECLS
+
 typedef	__uint32_t	fenv_t;
 typedef	__uint32_t	fexcept_t;
 
@@ -50,7 +53,6 @@ typedef	__uint32_t	fexcept_t;
 #define	FE_DOWNWARD	0x0003
 #define	_ROUND_MASK	(FE_TONEAREST | FE_DOWNWARD | \
 			 FE_UPWARD | FE_TOWARDZERO)
-/* __BEGIN_DECLS */
 
 /* Default floating-point environment */
 extern const fenv_t	__fe_dfl_env;
@@ -212,7 +214,7 @@ fegetexcept(void)
 
 #endif /* __BSD_VISIBLE */
 
-/* __END_DECLS */
+__END_DECLS
 
 #endif	/* !_FENV_H_ */