diff --git a/ujit.rb b/ujit.rb
index 43be881c05..3697e50b1c 100644
--- a/ujit.rb
+++ b/ujit.rb
@@ -1,5 +1,9 @@
 module UJIT
   def self.disasm(iseq)
+    if iseq.is_a? Method
+        iseq = RubyVM::InstructionSequence.of(iseq)
+    end
+
     blocks = UJIT.blocks_for(iseq)
     return if blocks.empty?
 
@@ -10,13 +14,14 @@ module UJIT
     str << iseq.disasm
     str << "\n"
 
+    # Sort the blocks by increasing addresses
     blocks.sort_by(&:address).reverse.each do |block|
-      str << "== ISEQ RANGE: #{block.iseq_start_index} -> #{block.iseq_end_index} ".ljust(80, "=")
+      str << "== ISEQ RANGE: [#{block.iseq_start_index},#{block.iseq_end_index}[ ".ljust(80, "=")
       str << "\n"
 
       cs.disasm(block.code, 0).each do |i|
         str << sprintf(
-          "\t0x%<address>x:\t%<instruction>s\t%<details>s\n",
+          "\t%<address>04X:\t%<instruction>s\t%<details>s\n",
           address: i.address,
           instruction: i.mnemonic,
           details: i.op_str
diff --git a/ujit_iface.c b/ujit_iface.c
index 591d9c044c..981c882ceb 100644
--- a/ujit_iface.c
+++ b/ujit_iface.c
@@ -397,7 +397,7 @@ ujit_disasm(VALUE self, VALUE code, VALUE from)
     cs_insn *insns;
 
     TypedData_Get_Struct(self, csh, &ujit_disasm_type, handle);
-    count = cs_disasm(*handle, (uint8_t *)StringValuePtr(code), RSTRING_LEN(code), NUM2INT(from), 0, &insns);
+    count = cs_disasm(*handle, (uint8_t*)StringValuePtr(code), RSTRING_LEN(code), NUM2INT(from), 0, &insns);
     VALUE insn_list = rb_ary_new_capa(count);
 
     for (size_t i = 0; i < count; i++) {