diff --git a/libc/include/sched.h b/libc/include/sched.h
index 7cb11a7..d407202 100644
--- a/libc/include/sched.h
+++ b/libc/include/sched.h
@@ -41,22 +41,22 @@
   int sched_priority;
 };
 
-extern int sched_setscheduler(pid_t, int, const struct sched_param*);
-extern int sched_getscheduler(pid_t);
-extern int sched_yield(void);
-extern int sched_get_priority_max(int);
-extern int sched_get_priority_min(int);
-extern int sched_setparam(pid_t, const struct sched_param*);
-extern int sched_getparam(pid_t, struct sched_param*);
-extern int sched_rr_get_interval(pid_t, struct timespec*);
+int sched_setscheduler(pid_t, int, const struct sched_param*);
+int sched_getscheduler(pid_t);
+int sched_yield(void);
+int sched_get_priority_max(int);
+int sched_get_priority_min(int);
+int sched_setparam(pid_t, const struct sched_param*);
+int sched_getparam(pid_t, struct sched_param*);
+int sched_rr_get_interval(pid_t, struct timespec*);
 
 #if defined(__USE_GNU)
 
-extern int clone(int (*)(void*), void*, int, void*, ...) __INTRODUCED_IN_ARM(9)
+int clone(int (*)(void*), void*, int, void*, ...) __INTRODUCED_IN_ARM(9)
     __INTRODUCED_IN_MIPS(12) __INTRODUCED_IN_X86(17);
-extern int unshare(int) __INTRODUCED_IN(17);
-extern int sched_getcpu(void) __INTRODUCED_IN(12);
-extern int setns(int, int) __INTRODUCED_IN(21);
+int unshare(int) __INTRODUCED_IN(17);
+int sched_getcpu(void) __INTRODUCED_IN(12);
+int setns(int, int) __INTRODUCED_IN(21);
 
 #ifdef __LP64__
 #define CPU_SETSIZE 1024
@@ -73,8 +73,8 @@
   __CPU_BITTYPE  __bits[ CPU_SETSIZE / __CPU_BITS ];
 } cpu_set_t;
 
-extern int sched_setaffinity(pid_t pid, size_t setsize, const cpu_set_t* set) __INTRODUCED_IN(12);
-extern int sched_getaffinity(pid_t pid, size_t setsize, cpu_set_t* set) __INTRODUCED_IN(12);
+int sched_setaffinity(pid_t pid, size_t setsize, const cpu_set_t* set) __INTRODUCED_IN(12);
+int sched_getaffinity(pid_t pid, size_t setsize, cpu_set_t* set) __INTRODUCED_IN(12);
 
 #define CPU_ZERO(set)          CPU_ZERO_S(sizeof(cpu_set_t), set)
 #define CPU_SET(cpu, set)      CPU_SET_S(cpu, sizeof(cpu_set_t), set)
@@ -97,8 +97,8 @@
 #define CPU_ALLOC(count)  __sched_cpualloc((count))
 #define CPU_FREE(set)     __sched_cpufree((set))
 
-extern cpu_set_t* __sched_cpualloc(size_t count) __INTRODUCED_IN(12);
-extern void __sched_cpufree(cpu_set_t* set) __INTRODUCED_IN(12);
+cpu_set_t* __sched_cpualloc(size_t count) __INTRODUCED_IN(12);
+void __sched_cpufree(cpu_set_t* set) __INTRODUCED_IN(12);
 
 #define CPU_ZERO_S(setsize, set)  __builtin_memset(set, 0, setsize)
 
@@ -142,7 +142,7 @@
 
 #define CPU_COUNT_S(setsize, set)  __sched_cpucount((setsize), (set))
 
-extern int __sched_cpucount(size_t setsize, cpu_set_t* set) __INTRODUCED_IN(12);
+int __sched_cpucount(size_t setsize, cpu_set_t* set) __INTRODUCED_IN(12);
 
 #endif /* __USE_GNU */