diff --git a/libc/include/stdlib.h b/libc/include/stdlib.h
index 2dc31332..b7ed9819 100644
--- a/libc/include/stdlib.h
+++ b/libc/include/stdlib.h
@@ -35,16 +35,16 @@ extern "C"
 #endif
 
     /* Return the absolute value of an integer. */
-    int abs(int v);
+    int abs(int);
 
     /* Return the absolute value of a long integer. */
-    long labs(long v);
+    long labs(long);
 
     /* Return the absolute value of a long long integer. */
-    long long llabs(long long v);
+    long long llabs(long long);
 
     /* Return the result of dividing two integers, including the remainder. */
-    div_t div(int num, int den);
+    div_t div(int, int);
 
     /* Return the result of dividing two long integers, including the remainder. */
     ldiv_t ldiv(long, long);
@@ -62,7 +62,7 @@ extern "C"
     void* realloc(void* ptr, size_t size);
 
     /* Free heap memory. */
-    void free(void*);
+    void free(void* ptr);
 
     /* Abort the program without performing any normal cleanup. */
     __noreturn void abort();