diff --git a/assembler-8608.lua b/assembler-8608.lua
index 7b308a6..d65536f 100644
--- a/assembler-8608.lua
+++ b/assembler-8608.lua
@@ -556,7 +556,7 @@ function AssembleFile(fn, romsizes, offsets, lens) local offset = tonumber(offse
 	local arch = arch8608
 	local mem = assembleFile(fn, arch)
 	printMemory(mem)
-	if #romsize>0 then assert(#romsize==3, "incorrect rom size") end
+	assert(#romsize==3, "incorrect rom size")
 	buildMemory(mem, romsize, offset, len)
 	disassembleMemory(mem, arch)
 end