diff --git a/metropolis/pkg/nvme/struct_test.go b/metropolis/pkg/nvme/struct_test.go
new file mode 100644
index 0000000..b26a48e
--- /dev/null
+++ b/metropolis/pkg/nvme/struct_test.go
@@ -0,0 +1,15 @@
+package nvme
+
+import (
+	"encoding/binary"
+	"testing"
+)
+
+// TestStruct tests if the struct passed to Linux's ioctl has the ABI-specified
+// size.
+func TestStruct(t *testing.T) {
+	passthruCmdSize := binary.Size(passthruCmd{})
+	if passthruCmdSize != 72 {
+		t.Errorf("passthroughCmd is %d bytes, expected 72", passthruCmdSize)
+	}
+}