diff --git a/.github/workflows/main.yml b/.github/workflows/main.yml
index a04ee58..e03f712 100644
--- a/.github/workflows/main.yml
+++ b/.github/workflows/main.yml
@@ -8,7 +8,7 @@ on:
 jobs:
   test:
     name: Build mode ${{ matrix.build_mode }}
-    runs-on: ubuntu-latest
+    runs-on: ubuntu-18.04
     strategy:
       matrix:
         build_mode: ["", -Drelease-fast, -Drelease-safe, -Drelease-small]
diff --git a/build.zig b/build.zig
index b20804c..3684b6b 100644
--- a/build.zig
+++ b/build.zig
@@ -264,7 +264,7 @@ const RamdiskStep = struct {
     out_file_path: []const u8,
 
     /// The possible errors for creating a ramdisk
-    const Error = (error{EndOfStream} || File.ReadError || File.GetPosError || Allocator.Error || File.WriteError || File.OpenError);
+    const Error = (error{EndOfStream} || File.ReadError || File.SeekError || Allocator.Error || File.WriteError || File.OpenError);
 
     ///
     /// Create and write the files to a raw ramdisk in the format: