diff --git a/test/standalone/simple/hello_world/hello_libc.zig b/test/standalone/simple/hello_world/hello_libc.zig
index 992afd736e76f7e52bb71c3eb482f98a0526a2a9..994ca31b8e23a9b8011ebe53c51f7b4f886b2fce 100644
--- a/test/standalone/simple/hello_world/hello_libc.zig
+++ b/test/standalone/simple/hello_world/hello_libc.zig
@@ -1,15 +1,11 @@
-const c = @cImport({
-    // See https://github.com/ziglang/zig/issues/515
-    @cDefine("_NO_CRT_STDIO_INLINE", "1");
-    @cInclude("stdio.h");
-    @cInclude("string.h");
-});
+extern fn printf(format: [*:0]const u8, ...) c_int;
+extern fn strlen(str: [*:0]const u8) usize;
 
 const msg = "Hello, world!\n";
 
 pub export fn main(argc: c_int, argv: **u8) c_int {
     _ = argv;
     _ = argc;
-    if (c.printf(msg) != @as(c_int, @intCast(c.strlen(msg)))) return -1;
+    if (printf(msg) != @as(c_int, @intCast(strlen(msg)))) return -1;
     return 0;
 }
diff --git a/test/standalone/static_c_lib/foo.zig b/test/standalone/static_c_lib/foo.zig
index da0287540871349cd777df35293fb01755e50b92..2ff5fadb95df1ae4177f3408df89d7f8e5c52e1e 100644
--- a/test/standalone/static_c_lib/foo.zig
+++ b/test/standalone/static_c_lib/foo.zig
@@ -1,12 +1,14 @@
 const std = @import("std");
 const expect = std.testing.expect;
-const c = @cImport(@cInclude("foo.h"));
+
+extern fn add(a: u32, b: u32) u32;
+extern var foo: u32;
 
 test "C add" {
-    const result = c.add(1, 2);
+    const result = add(1, 2);
     try expect(result == 3);
 }
 
 test "C extern variable" {
-    try expect(c.foo == 12345);
+    try expect(foo == 12345);
 }