diff --git a/libc/include/sys/cdefs.h b/libc/include/sys/cdefs.h
index a8fb624..a19ce26 100644
--- a/libc/include/sys/cdefs.h
+++ b/libc/include/sys/cdefs.h
@@ -260,7 +260,7 @@
  * them available externally. FORTIFY'ed functions try to be as close to possible as 'invisible';
  * having stack protectors detracts from that (b/182948263).
  */
-#  define __BIONIC_FORTIFY_INLINE static __inline__ __attribute__((no_stack_protector)) \
+#  define __BIONIC_FORTIFY_INLINE static inline __attribute__((no_stack_protector)) \
       __always_inline __VERSIONER_FORTIFY_INLINE
 /*
  * We should use __BIONIC_FORTIFY_VARIADIC instead of __BIONIC_FORTIFY_INLINE
@@ -268,7 +268,7 @@
  * The __always_inline attribute is useless, misleading, and could trigger
  * clang compiler bug to incorrectly inline variadic functions.
  */
-#  define __BIONIC_FORTIFY_VARIADIC static __inline__
+#  define __BIONIC_FORTIFY_VARIADIC static inline
 /* Error functions don't have bodies, so they can just be static. */
 #  define __BIONIC_ERROR_FUNCTION_VISIBILITY static __attribute__((unused))
 #else
@@ -327,7 +327,7 @@
 #define __size_mul_overflow(a, b, result) __builtin_umul_overflow(a, b, result)
 #endif
 #else
-extern __inline__ __always_inline __attribute__((gnu_inline))
+extern inline __always_inline __attribute__((gnu_inline))
 int __size_mul_overflow(__SIZE_TYPE__ a, __SIZE_TYPE__ b, __SIZE_TYPE__ *result) {
     *result = a * b;
     static const __SIZE_TYPE__ mul_no_overflow = 1UL << (sizeof(__SIZE_TYPE__) * 4);