diff --git a/headers/posix/arch/arm/fenv.h b/headers/posix/arch/arm/fenv.h
index f07e82ed73..308976c024 100644
--- a/headers/posix/arch/arm/fenv.h
+++ b/headers/posix/arch/arm/fenv.h
@@ -179,7 +179,7 @@ feupdateenv(const fenv_t *__envp)
 	return (0);
 }
 
-#if __BSD_VISIBLE
+#ifdef _DEFAULT_SOURCE
 
 static __inline int
 feenableexcept(int __mask)
@@ -212,7 +212,7 @@ fegetexcept(void)
 	return ((__fpsr & _ENABLE_MASK) >> _FPUSW_SHIFT);
 }
 
-#endif /* __BSD_VISIBLE */
+#endif /* _DEFAULT_SOURCE */
 
 __END_DECLS
 
diff --git a/headers/posix/arch/arm64/fenv.h b/headers/posix/arch/arm64/fenv.h
index 1d197f0b01..322cb71a94 100644
--- a/headers/posix/arch/arm64/fenv.h
+++ b/headers/posix/arch/arm64/fenv.h
@@ -206,7 +206,7 @@ feupdateenv(const fenv_t *__envp)
 	return (0);
 }
 
-#if __BSD_VISIBLE
+#ifdef _DEFAULT_SOURCE
 
 /* We currently provide no external definitions of the functions below. */
 
@@ -241,7 +241,7 @@ fegetexcept(void)
 	return ((__r & _ENABLE_MASK) >> _FPUSW_SHIFT);
 }
 
-#endif /* __BSD_VISIBLE */
+#endif /* _DEFAULT_SOURCE */
 
 __END_DECLS
 
diff --git a/headers/posix/arch/ppc/fenv.h b/headers/posix/arch/ppc/fenv.h
index c1993657fb..373cceea30 100644
--- a/headers/posix/arch/ppc/fenv.h
+++ b/headers/posix/arch/ppc/fenv.h
@@ -226,7 +226,7 @@ feupdateenv(const fenv_t *__envp)
 	return (0);
 }
 
-#if __BSD_VISIBLE
+#ifdef _DEFAULT_SOURCE
 
 static __inline int
 feenableexcept(int __mask)
@@ -263,7 +263,7 @@ fegetexcept(void)
 	return ((__r.__bits.__reg & _ENABLE_MASK) << _FPUSW_SHIFT);
 }
 
-#endif /* __BSD_VISIBLE */
+#endif /* _DEFAULT_SOURCE */
 
 __END_DECLS
 
diff --git a/headers/posix/arch/riscv64/fenv.h b/headers/posix/arch/riscv64/fenv.h
index 5d2776c2b9..15a01bdb77 100644
--- a/headers/posix/arch/riscv64/fenv.h
+++ b/headers/posix/arch/riscv64/fenv.h
@@ -218,7 +218,7 @@ feupdateenv(const fenv_t *__envp)
 }
 #endif /* !__riscv_float_abi_soft */
 
-#if __BSD_VISIBLE
+#ifdef _DEFAULT_SOURCE
 
 /* We currently provide no external definitions of the functions below. */
 
@@ -255,7 +255,7 @@ fegetexcept(void)
 }
 #endif /* !__riscv_float_abi_soft */
 
-#endif /* __BSD_VISIBLE */
+#endif /* _DEFAULT_SOURCE */
 
 __END_DECLS
 
diff --git a/headers/posix/arch/sparc64/fenv.h b/headers/posix/arch/sparc64/fenv.h
index 903d770f3d..1a0b370858 100644
--- a/headers/posix/arch/sparc64/fenv.h
+++ b/headers/posix/arch/sparc64/fenv.h
@@ -222,7 +222,7 @@ feupdateenv(const fenv_t *__envp)
 	return (0);
 }
 
-#if __BSD_VISIBLE
+#ifdef _DEFAULT_SOURCE
 
 /* We currently provide no external definitions of the functions below. */
 
@@ -257,7 +257,7 @@ fegetexcept(void)
 	return ((__r & _ENABLE_MASK) >> _FPUSW_SHIFT);
 }
 
-#endif /* __BSD_VISIBLE */
+#endif /* _DEFAULT_SOURCE */
 
 __END_DECLS
 
diff --git a/headers/posix/arch/x86/fenv.h b/headers/posix/arch/x86/fenv.h
index 71b48e22f7..714351c719 100644
--- a/headers/posix/arch/x86/fenv.h
+++ b/headers/posix/arch/x86/fenv.h
@@ -227,7 +227,7 @@ fesetenv(const fenv_t *__envp)
 
 int feupdateenv(const fenv_t *__envp);
 
-#if __BSD_VISIBLE
+#ifdef _DEFAULT_SOURCE
 
 int feenableexcept(int __mask);
 int fedisableexcept(int __mask);
@@ -245,7 +245,7 @@ fegetexcept(void)
 	return (~__control & FE_ALL_EXCEPT);
 }
 
-#endif /* __BSD_VISIBLE */
+#endif /* _DEFAULT_SOURCE */
 
 __END_DECLS
 
diff --git a/headers/posix/arch/x86_64/fenv.h b/headers/posix/arch/x86_64/fenv.h
index 9a3df8eb9d..fdef27e398 100644
--- a/headers/posix/arch/x86_64/fenv.h
+++ b/headers/posix/arch/x86_64/fenv.h
@@ -193,7 +193,7 @@ fesetenv(const fenv_t *__envp)
 
 int feupdateenv(const fenv_t *__envp);
 
-#if __BSD_VISIBLE
+#ifdef _DEFAULT_SOURCE
 
 int feenableexcept(int __mask);
 int fedisableexcept(int __mask);
@@ -211,7 +211,7 @@ fegetexcept(void)
 	return (~__control & FE_ALL_EXCEPT);
 }
 
-#endif /* __BSD_VISIBLE */
+#endif /* _DEFAULT_SOURCE */
 
 __END_DECLS