diff --git a/LEGO1/decomp.h b/LEGO1/decomp.h
new file mode 100644
index 00000000..512af280
--- /dev/null
+++ b/LEGO1/decomp.h
@@ -0,0 +1,10 @@
+#ifndef DECOMP_H
+#define DECOMP_H
+
+#define DECOMP_STATIC_ASSERT(V) namespace { typedef int foo[(V)?1:-1]; }
+
+typedef unsigned char undefined;
+typedef unsigned short undefined2;
+typedef unsigned int undefined4;
+
+#endif // DECOMP_H