diff --git a/lib/std/Build/Module.zig b/lib/std/Build/Module.zig
index 9daa89deb8d5b5c047d5062b06654ddbccec64c6..ce17d655a028fd7e2844aef3612ea78f23f17b2a 100644
--- a/lib/std/Build/Module.zig
+++ b/lib/std/Build/Module.zig
@@ -88,7 +88,7 @@ pub const CSourceFiles = struct {
 
 pub const CSourceFile = struct {
     file: LazyPath,
-    flags: []const []const u8,
+    flags: []const []const u8 = &.{},
 
     pub fn dupe(self: CSourceFile, b: *std.Build) CSourceFile {
         return .{