diff --git a/build.zig b/build.zig
index 1619cb1..ae724d7 100644
--- a/build.zig
+++ b/build.zig
@@ -15,9 +15,9 @@ pub fn build(b: *std.Build) void {
     // set a preferred release mode, allowing the user to decide how to optimize.
     const optimize = b.standardOptimizeOption(.{});
 
-    _ = b.addModule("sonic-fasta", .{ .source_file = .{ .path = "src/fasta.zig" } });
-
-    _ = b.addModule("sonic", .{ .source_file = .{ .path = "src/records.zig" } });
+    // Module declarations
+    _ = b.addModule("sonic-fasta", .{ .root_source_file = .{ .path = "src/fasta.zig" } });
+    _ = b.addModule("sonic", .{ .root_source_file = .{ .path = "src/records.zig" } });
 
     const fasta = b.addExecutable(.{
         .name = "pdb2fasta",
diff --git a/flake.nix b/flake.nix
index 1060de3..9a0e7a2 100644
--- a/flake.nix
+++ b/flake.nix
@@ -21,7 +21,7 @@
     flake-utils.lib.eachSystem systems (system:
       let
         pkgs = nixpkgs.legacyPackages.${system};
-        zig = zig-overlay.packages.${system}.master-2023-12-31;
+        zig = zig-overlay.packages.${system}.master;
       in
       rec {
         formatter = nixpkgs.legacyPackages.${system}.nixpkgs-fmt;