diff --git a/aide.spec b/aide.spec
index 2191f4057ade110b99bba7e4d9cbe4bfb6afaf8b..b2bbb60b844a8658ff7aa936481dac65d1586dbd 100644
--- a/aide.spec
+++ b/aide.spec
@@ -2,7 +2,7 @@
 
 Name:       aide
 Version:    0.18.6
-Release:    2
+Release:    3
 Summary:    Advanced Intrusion Detection Environment
 License:    GPLv2+
 URL:        https://sourceforge.net/projects/aide
@@ -22,6 +22,7 @@ Requires:  libgcrypt-sm3
 
 Patch0:    Add-sm3-algorithm-for-aide.patch 
 Patch1:    backport-Fix-condition-for-error-message-of-failing-to-open-g.patch
+Patch2:    backport-Fix-parsing-of-lowercase-group-names.patch
 
 %description
 AIDE (Advanced Intrusion Detection Environment, [eyd]) is a file and directory integrity checker.
@@ -74,6 +75,12 @@ make check
 %{_mandir}/*/*
 
 %changelog
+* Wed Sep 4 2024 yixiangzhike <yixiangzhike007@163.com> - 0.18.6-3
+- Type: bugfix
+- ID: NA
+- SUG: NA
+- DESC: backport upstream patch to fix parsing of lowercase group names
+
 * Thu Jul 4 2024 yixiangzhike <yixiangzhike007@163.com> - 0.18.6-2
 - Type: bugfix
 - ID: NA
diff --git a/backport-Fix-parsing-of-lowercase-group-names.patch b/backport-Fix-parsing-of-lowercase-group-names.patch
new file mode 100644
index 0000000000000000000000000000000000000000..d67dda8891b9ba4e8627f24e9393470f2d9f95d2
--- /dev/null
+++ b/backport-Fix-parsing-of-lowercase-group-names.patch
@@ -0,0 +1,47 @@
+From 9ed0843765f0f97f6d3f989995a492da20b8c410 Mon Sep 17 00:00:00 2001
+From: Hannes von Haugwitz <hannes@vonhaugwitz.com>
+Date: Tue, 3 Sep 2024 19:41:19 +0200
+Subject: [PATCH] Fix parsing of lowercase group names
+
+* closes: #176
+---
+ ChangeLog      | 3 +++
+ src/conf_lex.l | 4 +---
+ 2 files changed, 4 insertions(+), 3 deletions(-)
+
+diff --git a/ChangeLog b/ChangeLog
+index 3505168..df764e9 100644
+--- a/ChangeLog
++++ b/ChangeLog
+@@ -1,3 +1,6 @@
++2024-09-03 Hannes von Haugwitz <hannes@vonhaugwitz.com>
++	* Fix parsing of lowercase group names (closes: #176)
++
+ 2023-08-01 Hannes von Haugwitz <hannes@vonhaugwitz.com>
+	* Release aide 0.18.6
+
+diff --git a/src/conf_lex.l b/src/conf_lex.l
+index 4186101..0cf8c71 100644
+--- a/src/conf_lex.l
++++ b/src/conf_lex.l
+@@ -5,8 +5,6 @@ G	[a-zA-Z0-9]
+ V	[a-zA-Z_]+[a-zA-Z0-9_]*
+ E	[\ ]*"="[\ ]*
+ 
+-O	[a-z_]
+-
+ %{
+ 
+ #define YYDEBUG 1
+@@ -460,7 +458,7 @@ LOG_LEVEL lex_log_level = LOG_LEVEL_DEBUG;
+   return (CONFIGOPTION);
+ }
+ 
+-<CONFIG>({O})+ {
++<CONFIG>[a-z]+(_[a-z]+)+ {
+   log_msg(LOG_LEVEL_ERROR,"%s:%d: unknown config option: '%s' (line: '%s')", conf_filename, conf_linenumber, conftext, conf_linebuf);
+   exit(INVALID_CONFIGURELINE_ERROR);
+ }
+-- 
+2.33.0
+