diff --git a/tools/process_headers.zig b/tools/process_headers.zig
index b5bce2ef7fdc7f22ed75eb73b39fe149a7c070b2..d3486c06935973f2b095af786bf41e5f79be7e0a 100644
--- a/tools/process_headers.zig
+++ b/tools/process_headers.zig
@@ -249,7 +249,7 @@ const Contents = struct {
 };
 
 const HashToContents = std.StringHashMap(Contents);
-const TargetToHash = std.HashMap(DestTarget, []const u8, DestTarget.hash, DestTarget.eql, true);
+const TargetToHash = std.ArrayHashMap(DestTarget, []const u8, DestTarget.hash, DestTarget.eql, true);
 const PathTable = std.StringHashMap(*TargetToHash);
 
 const LibCVendor = enum {