diff --git a/ir-test.cxx b/ir-test.cxx
index 4555ef2..74390d7 100644
--- a/ir-test.cxx
+++ b/ir-test.cxx
@@ -24,13 +24,15 @@
 # define PATH_SEP "\\"
 # define EXE_SUF ".exe"
 # define REGEX_FLAGS std::regex::extended
-# define DIFF_ARGS "--strip-trailing-cr"
+# define DIFF_CMD "fc.exe"
+# define DIFF_ARGS "/n"
 # define IR_ARGS "--no-abort-fault"
 #else
 # define PATH_SEP "/"
 # define EXE_SUF ""
 # define REGEX_FLAGS std::regex::ECMAScript | std::regex::multiline
-# define DIFF_ARGS ""
+# define DIFF_CMD "diff"
+# define DIFF_ARGS "--strip-trailing-cr -u"
 # define IR_ARGS ""
 #endif
 
@@ -182,7 +184,7 @@ namespace ir {
 			in_os.close();
 
 			auto test_cmd = ::ir_exe + " " + ir_file + " " + args + " " + IR_ARGS + " >" + out_file + " 2>&1";
-			auto diff_cmd = std::string("diff") + " " + DIFF_ARGS + " -u " + exp_file + " " + out_file + " > " + diff_file + " 2>&1";
+			auto diff_cmd = std::string(DIFF_CMD) + " " + DIFF_ARGS + " " + exp_file + " " + out_file + " > " + diff_file + " 2>&1";
 
 			int ret_code = std::system(test_cmd.c_str()) >> 0x8;