diff --git a/kitty/parser.c b/kitty/parser.c
index 22f164fbb..8d8b538ca 100644
--- a/kitty/parser.c
+++ b/kitty/parser.c
@@ -612,7 +612,7 @@ dispatch_csi(Screen *screen, PyObject DUMP_UNUSED *dump_callback) {
     unsigned int num = screen->parser_buf_pos, start, i, num_params=0, p1, p2;
     static unsigned int params[MAX_PARAMS] = {0};
     bool private;
-    if (buf[0] == '>' || buf[0] == '?' || buf[0] == '!') {
+    if (buf[0] == '>' || buf[0] == '?' || buf[0] == '!' || buf[0] == '=') {
         start_modifier = (char)screen->parser_buf[0];
         buf++; num--;
     }
@@ -993,6 +993,7 @@ accumulate_csi(Screen *screen, uint32_t ch, PyObject DUMP_UNUSED *dump_callback)
         case '?':
         case '>':
         case '!':
+        case '=':
             if (screen->parser_buf_pos != 0) {
                 REPORT_ERROR("Invalid character in CSI: 0x%x, ignoring the sequence", ch);
                 SET_STATE(0);
diff --git a/kitty_tests/parser.py b/kitty_tests/parser.py
index 9d3a29beb..6041da252 100644
--- a/kitty_tests/parser.py
+++ b/kitty_tests/parser.py
@@ -114,6 +114,7 @@ class TestParser(BaseTest):
         pb('\033[20;4h', ('screen_set_mode', 20, 0), ('screen_set_mode', 4, 0))
         pb('\033[?1000;1004h', ('screen_set_mode', 1000, 1), ('screen_set_mode', 1004, 1))
         pb('\033[20;4;20l', ('screen_reset_mode', 20, 0), ('screen_reset_mode', 4, 0), ('screen_reset_mode', 20, 0))
+        pb('\033[=c', ('report_device_attributes', 0, 61))
         s.reset()
 
         def sgr(params):