diff --git a/std/c.zig b/std/c.zig
index 7ba606c18ba30beeb87925398f6af500c5172edc..e7b98107ab72bca8f82c9bd8311a69bc7a8c107e 100644
--- a/std/c.zig
+++ b/std/c.zig
@@ -55,6 +55,7 @@ pub extern "c" fn fclose(stream: *FILE) c_int;
 pub extern "c" fn fwrite(ptr: [*]const u8, size_of_type: usize, item_count: usize, stream: *FILE) usize;
 pub extern "c" fn fread(ptr: [*]u8, size_of_type: usize, item_count: usize, stream: *FILE) usize;
 
+pub extern "c" fn printf(format: [*]const u8, ...) c_int;
 pub extern "c" fn abort() noreturn;
 pub extern "c" fn exit(code: c_int) noreturn;
 pub extern "c" fn isatty(fd: fd_t) c_int;