diff --git a/.github/workflows/test.yml b/.github/workflows/test.yml
index 8af7140c6..834d49a5c 100644
--- a/.github/workflows/test.yml
+++ b/.github/workflows/test.yml
@@ -561,7 +561,16 @@ jobs:
           name: ghostty
           authToken: "${{ secrets.CACHIX_AUTH_TOKEN }}"
 
-      - name: Test GTK Build
+      - name: Test
+        run: |
+          nix develop -c \
+            zig build \
+            -Dapp-runtime=gtk \
+            -Dgtk-x11=${{ matrix.x11 }} \
+            -Dgtk-wayland=${{ matrix.wayland }} \
+            test
+
+      - name: Build
         run: |
           nix develop -c \
             zig build \
diff --git a/src/apprt/gtk/gtk_version.zig b/src/apprt/gtk/gtk_version.zig
index 5d75fb4fe..6f3d733a5 100644
--- a/src/apprt/gtk/gtk_version.zig
+++ b/src/apprt/gtk/gtk_version.zig
@@ -103,7 +103,7 @@ pub inline fn runtimeUntil(
 test "atLeast" {
     const testing = std.testing;
 
-    const funs = &.{ atLeast, runtimeAtLeast, runtimeUntil };
+    const funs = &.{ atLeast, runtimeAtLeast };
     inline for (funs) |fun| {
         try testing.expect(fun(c.GTK_MAJOR_VERSION, c.GTK_MINOR_VERSION, c.GTK_MICRO_VERSION));
 
@@ -118,3 +118,23 @@ test "atLeast" {
         try testing.expect(fun(c.GTK_MAJOR_VERSION, c.GTK_MINOR_VERSION - 1, c.GTK_MICRO_VERSION + 1));
     }
 }
+
+test "runtimeUntil" {
+    const testing = std.testing;
+
+    // This is an array in case we add a comptime variant.
+    const funs = &.{runtimeUntil};
+    inline for (funs) |fun| {
+        try testing.expect(!fun(c.GTK_MAJOR_VERSION, c.GTK_MINOR_VERSION, c.GTK_MICRO_VERSION));
+
+        try testing.expect(fun(c.GTK_MAJOR_VERSION, c.GTK_MINOR_VERSION, c.GTK_MICRO_VERSION + 1));
+        try testing.expect(fun(c.GTK_MAJOR_VERSION, c.GTK_MINOR_VERSION + 1, c.GTK_MICRO_VERSION));
+        try testing.expect(fun(c.GTK_MAJOR_VERSION + 1, c.GTK_MINOR_VERSION, c.GTK_MICRO_VERSION));
+
+        try testing.expect(!fun(c.GTK_MAJOR_VERSION - 1, c.GTK_MINOR_VERSION, c.GTK_MICRO_VERSION));
+        try testing.expect(!fun(c.GTK_MAJOR_VERSION - 1, c.GTK_MINOR_VERSION + 1, c.GTK_MICRO_VERSION));
+        try testing.expect(!fun(c.GTK_MAJOR_VERSION - 1, c.GTK_MINOR_VERSION, c.GTK_MICRO_VERSION + 1));
+
+        try testing.expect(!fun(c.GTK_MAJOR_VERSION, c.GTK_MINOR_VERSION - 1, c.GTK_MICRO_VERSION + 1));
+    }
+}
diff --git a/src/os/kernel_info.zig b/src/os/kernel_info.zig
index 9e3933dde..e57cc3047 100644
--- a/src/os/kernel_info.zig
+++ b/src/os/kernel_info.zig
@@ -17,7 +17,7 @@ test "read /proc/sys/kernel/osrelease" {
     if (comptime builtin.os.tag != .linux) return null;
     const allocator = std.testing.allocator;
 
-    const kernel_info = try getKernelInfo(allocator);
+    const kernel_info = getKernelInfo(allocator).?;
     defer allocator.free(kernel_info);
 
     // Since we can't hardcode the info in tests, just check
diff --git a/src/os/main.zig b/src/os/main.zig
index 7398fc779..41dc6aa29 100644
--- a/src/os/main.zig
+++ b/src/os/main.zig
@@ -2,6 +2,8 @@
 //! system. These aren't restricted to syscalls or low-level operations, but
 //! also OS-specific features and conventions.
 
+const builtin = @import("builtin");
+
 const dbus = @import("dbus.zig");
 const desktop = @import("desktop.zig");
 const env = @import("env.zig");
@@ -14,7 +16,7 @@ const openpkg = @import("open.zig");
 const pipepkg = @import("pipe.zig");
 const resourcesdir = @import("resourcesdir.zig");
 const systemd = @import("systemd.zig");
-const kernelInfo = @import("kernel_info.zig");
+const kernel_info = @import("kernel_info.zig");
 
 // Namespaces
 pub const args = @import("args.zig");
@@ -59,8 +61,12 @@ pub const pipe = pipepkg.pipe;
 pub const resourcesDir = resourcesdir.resourcesDir;
 pub const ResourcesDir = resourcesdir.ResourcesDir;
 pub const ShellEscapeWriter = shell.ShellEscapeWriter;
-pub const getKernelInfo = kernelInfo.getKernelInfo;
+pub const getKernelInfo = kernel_info.getKernelInfo;
 
 test {
     _ = i18n;
+
+    if (comptime builtin.os.tag == .linux) {
+        _ = kernel_info;
+    }
 }