diff --git a/src/common/config/config.cpp b/src/common/config/config.cpp
index 6d5f6803f0..ce958cdac5 100644
--- a/src/common/config/config.cpp
+++ b/src/common/config/config.cpp
@@ -113,7 +113,8 @@ const ConfigImpl::ConfigEntry ConfigImpl::entries[] =
 #else
  	{TYPE_BOOLEAN,		"BugcheckAbort",			(ConfigValue) false},	// whether to abort() engine when internal error is found
 #endif
-	{TYPE_INTEGER,		"TraceDSQL",				(ConfigValue) 0}			// bitmask
+	{TYPE_INTEGER,		"TraceDSQL",				(ConfigValue) 0},		// bitmask
+	{TYPE_BOOLEAN,		"LegacyHash",				(ConfigValue) false}	// let use old passwd hash verification
 };
 
 /******************************************************************************
@@ -483,3 +484,7 @@ int Config::getTraceDSQL()
 	return (int) sysConfig.values[KEY_TRACE_DSQL];
 }
 
+bool Config::getLegacyHash()
+{
+	return (bool) sysConfig.values[KEY_LEGACY_HASH];
+}
diff --git a/src/common/config/config.h b/src/common/config/config.h
index 92ab5eb63e..e0e3c19cb4 100644
--- a/src/common/config/config.h
+++ b/src/common/config/config.h
@@ -105,7 +105,8 @@ class Config
 		KEY_UDF_ACCESS,								// 39
 		KEY_TEMP_DIRECTORIES,						// 40
  		KEY_BUGCHECK_ABORT,							// 41
-		KEY_TRACE_DSQL								// 42
+		KEY_TRACE_DSQL,								// 42
+		KEY_LEGACY_HASH								// 43
 	};
 
 public:
@@ -324,6 +325,11 @@ public:
  		Abort on BUGCHECK and structured exceptions
  	*/
  	static bool getBugcheckAbort();
+
+	/*
+		Let use of des hash to verify passwords
+	*/
+	static bool getLegacyHash();
 };
 
 namespace Firebird {