diff --git a/build-python-3.11.patch b/build-python-3.11.patch
new file mode 100644
index 0000000..6f6cea2
--- /dev/null
+++ b/build-python-3.11.patch
@@ -0,0 +1,12 @@
+diff -up firefox-102.0/xpcom/idl-parser/xpidl/xpidl.py.python-311 firefox-102.0/xpcom/idl-parser/xpidl/xpidl.py
+--- firefox-102.0/xpcom/idl-parser/xpidl/xpidl.py.python-311	2022-07-15 14:23:10.890868155 +0200
++++ firefox-102.0/xpcom/idl-parser/xpidl/xpidl.py	2022-07-15 14:42:17.308836813 +0200
+@@ -1572,7 +1572,7 @@ class IDLParser(object):
+     t_ignore = " \t"
+ 
+     def t_multilinecomment(self, t):
+-        r"/\*(?s).*?\*/"
++        r"/\*(?s:.)*?\*/"
+         t.lexer.lineno += t.value.count("\n")
+         if t.value.startswith("/**"):
+             self._doccomments.append(t.value)
diff --git a/firefox.spec b/firefox.spec
index d7dce3f..0891447 100644
--- a/firefox.spec
+++ b/firefox.spec
@@ -226,6 +226,7 @@ Patch62:        build-python.patch
 Patch71:        0001-GLIBCXX-fix-for-GCC-12.patch
 Patch75:        mozilla-1773336.patch
 Patch76:        D147721-python3.11.diff
+Patch77:        build-python-3.11.patch
 
 # Test patches
 # Generate without context by
@@ -507,6 +508,7 @@ This package contains results of tests executed during build.
 # Needs for new cbindgen only
 %patch75 -p1 -b .1773336
 %patch76 -p1 -b .D147721-python3.11.diff
+%patch77 -p1 -b .build-python-3.11
 
 # Test patches
 #%patch100 -p1 -b .firefox-tests-xpcshell