diff --git a/src/main/cpp/dailyrollingfileappender.cpp b/src/main/cpp/dailyrollingfileappender.cpp
index 6f57cc3..9d58fcb 100644
--- a/src/main/cpp/dailyrollingfileappender.cpp
+++ b/src/main/cpp/dailyrollingfileappender.cpp
@@ -53,7 +53,7 @@
 	datePattern = newPattern;
 }
 
-LogString DailyRollingFileAppender::getDatePattern()
+LogString DailyRollingFileAppender::getDatePattern() const
 {
 	return datePattern;
 }
diff --git a/src/main/include/log4cxx/dailyrollingfileappender.h b/src/main/include/log4cxx/dailyrollingfileappender.h
index 2ace32d..e8384c6 100644
--- a/src/main/include/log4cxx/dailyrollingfileappender.h
+++ b/src/main/include/log4cxx/dailyrollingfileappender.h
@@ -183,7 +183,7 @@
 		void setDatePattern(const LogString& pattern);
 
 		/** Returns the value of the <b>DatePattern</b> option. */
-		LogString getDatePattern();
+		LogString getDatePattern() const;
 
 		void setOption(const LogString& option,
 			const LogString& value);