diff --git a/conanfile.py b/conanfile.py
index 16c4477..00d23bf 100644
--- a/conanfile.py
+++ b/conanfile.py
@@ -27,7 +27,7 @@ class LibconfigConan(ConanFile):
 
     def set_version(self):
         configure_ac = tools.load(os.path.join(self.recipe_folder, "configure.ac"))
-        self.version = next(re.finditer(r"AC_INIT\(libconfig,[ \t]+([0-9.]+),.*", configure_ac)).group(1)
+        self.version = next(re.finditer(r"AC_INIT\(\[libconfig\],[ \t]*\[([0-9.]+)\],.*", configure_ac)).group(1)
 
     def config_options(self):
         if self.settings.os == "Windows":
@@ -67,4 +67,4 @@ def package_info(self):
             self.cpp_info.components["libconfig_cpp"].defines = ["LIBCONFIGXX_STATIC"]
         self.cpp_info.components["libconfig_cpp"].names["cmake_find_package"] = ["libconfig++"]
         self.cpp_info.components["libconfig_cpp"].names["cmake_find_package_multi"] = ["libconfig++"]
-        self.cpp_info.components["libconfig_cpp"].names["pg_config"] = "libconfig++"
\ No newline at end of file
+        self.cpp_info.components["libconfig_cpp"].names["pg_config"] = "libconfig++"