diff --git a/src/devices/cpu/h8500/h8500dasm.cpp b/src/devices/cpu/h8500/h8500dasm.cpp
index 9bb33322fe3..5bea8496b50 100644
--- a/src/devices/cpu/h8500/h8500dasm.cpp
+++ b/src/devices/cpu/h8500/h8500dasm.cpp
@@ -426,7 +426,7 @@ offs_t h8500_disassembler::dasm_immop(std::ostream &stream, offs_t pc, bool w, c
 		return (w ? 4 : 3) | SUPPORTED;
 	}
 	else
-		return dasm_illegal(stream, w ? 0x04 : 0x0c);
+		return dasm_illegal(stream, w ? 0x0c : 0x04);
 }
 
 offs_t h8500_disassembler::disassemble(std::ostream &stream, offs_t pc, const h8500_disassembler::data_buffer &opcodes, const h8500_disassembler::data_buffer &params)