diff --git a/compat/mingw.c b/compat/mingw.c
index 0b86861a96..50f3429c85 100644
--- a/compat/mingw.c
+++ b/compat/mingw.c
@@ -1134,13 +1134,13 @@ static const char *quote_arg_msys2(const char *arg)
 
 	for (p = arg; *p; p++) {
 		int ws = isspace(*p);
-		if (!ws && *p != '\\' && *p != '"')
+		if (!ws && *p != '\\' && *p != '"' && *p != '{')
 			continue;
 		if (!buf.len)
 			strbuf_addch(&buf, '"');
 		if (p != p2)
 			strbuf_add(&buf, p2, p - p2);
-		if (!ws)
+		if (!ws && *p != '{')
 			strbuf_addch(&buf, '\\');
 		p2 = p;
 	}
diff --git a/t/t0061-run-command.sh b/t/t0061-run-command.sh
index 3063bb76f5..3b6e3af094 100755
--- a/t/t0061-run-command.sh
+++ b/t/t0061-run-command.sh
@@ -182,4 +182,14 @@ test_expect_success 'GIT_TRACE with environment variables' '
 	)
 '
 
+test_expect_success MINGW 'verify curlies are quoted properly' '
+	: force the rev-parse through the MSYS2 Bash &&
+	git -c alias.r="!git rev-parse" r -- a{b}c >actual &&
+	cat >expect <<-\EOF &&
+	--
+	a{b}c
+	EOF
+	test_cmp expect actual
+'
+
 test_done