diff --git a/Makefile.am b/Makefile.am
index b8828cc..4539633 100644
--- a/Makefile.am
+++ b/Makefile.am
@@ -14,4 +14,6 @@ bin_PROGRAMS = \
 	steam
 
 steam_SOURCES = \
+	src/lsi.h \
+	src/lsi.c \
 	src/shim.c
diff --git a/src/lsi.c b/src/lsi.c
new file mode 100644
index 0000000..7a1b4e7
--- /dev/null
+++ b/src/lsi.c
@@ -0,0 +1,33 @@
+/*
+ * This file is part of linux-steam-integration.
+ *
+ * Copyright (C) 2016 Ikey Doherty
+ *
+ * linux-steam-integration is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public License as
+ * published by the Free Software Foundation; either version 2.1
+ * of the License, or (at your option) any later version.
+ */
+
+#include "lsi.h"
+
+bool lsi_system_is_64bit(void)
+{
+#if UINTPTR_MAX == 0xffffffffffffffff
+        return true;
+#endif
+        return false;
+}
+
+/*
+ * Editor modelines  -  https://www.wireshark.org/tools/modelines.html
+ *
+ * Local variables:
+ * c-basic-offset: 8
+ * tab-width: 8
+ * indent-tabs-mode: nil
+ * End:
+ *
+ * vi: set shiftwidth=8 tabstop=8 expandtab:
+ * :indentSize=8:tabSize=8:noTabs=true:
+ */
diff --git a/src/lsi.h b/src/lsi.h
new file mode 100644
index 0000000..2aa840e
--- /dev/null
+++ b/src/lsi.h
@@ -0,0 +1,32 @@
+/*
+ * This file is part of linux-steam-integration.
+ *
+ * Copyright (C) 2016 Ikey Doherty
+ *
+ * linux-steam-integration is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public License as
+ * published by the Free Software Foundation; either version 2.1
+ * of the License, or (at your option) any later version.
+ */
+
+#pragma once
+
+#include <stdbool.h>
+
+/**
+ * Determine if the host system is 64-bit.
+ */
+bool lsi_system_is_64bit(void);
+
+/*
+ * Editor modelines  -  https://www.wireshark.org/tools/modelines.html
+ *
+ * Local variables:
+ * c-basic-offset: 8
+ * tab-width: 8
+ * indent-tabs-mode: nil
+ * End:
+ *
+ * vi: set shiftwidth=8 tabstop=8 expandtab:
+ * :indentSize=8:tabSize=8:noTabs=true:
+ */