diff --git a/compiler-rt/SDKs/linux/usr/include/stdlib.h b/compiler-rt/SDKs/linux/usr/include/stdlib.h
index 2fe745a00d66..2a6617ae3cf1 100644
--- a/compiler-rt/SDKs/linux/usr/include/stdlib.h
+++ b/compiler-rt/SDKs/linux/usr/include/stdlib.h
@@ -22,7 +22,7 @@
 typedef __SIZE_TYPE__ size_t;
 
 void abort(void) __attribute__((__nothrow__)) __attribute__((__noreturn__));
-void atoi(const char *) __attribute__((__nothrow__));
+int atoi(const char *) __attribute__((__nothrow__));
 void free(void *) __attribute__((__nothrow__));
 char *getenv(const char *) __attribute__((__nothrow__))
   __attribute__((__nonnull__(1)));