diff --git a/sonoff/_changelog.ino b/sonoff/_changelog.ino
index 704e95d67..27b47a02f 100644
--- a/sonoff/_changelog.ino
+++ b/sonoff/_changelog.ino
@@ -1,6 +1,7 @@
 /* 6.4.1.9 20190115
  * Add support for Mi LED Desk Lamp with rotary switch (#4887)
  * Fix mDNS addService (#4938)
+ * Fix allowable MAX_RULE_VARS to 16 (#4933)
  *
  * 6.4.1.8 20190107
  * Change sonoff_template.h layout regarding optional module flags like ADC0
diff --git a/sonoff/xdrv_10_rules.ino b/sonoff/xdrv_10_rules.ino
index df2db9748..5c43db43c 100644
--- a/sonoff/xdrv_10_rules.ino
+++ b/sonoff/xdrv_10_rules.ino
@@ -95,13 +95,13 @@ uint8_t rules_teleperiod = 0;
 
 char event_data[100];
 char vars[MAX_RULE_VARS][33] = { 0 };
-#if (MAX_RULE_VARS>8)
-#error MAX_RULE_VARS is bigger than 8
+#if (MAX_RULE_VARS>16)
+#error MAX_RULE_VARS is bigger than 16
 #endif
-#if (MAX_RULE_MEMS>8)
-#error MAX_RULE_MEMS is bigger than 8
+#if (MAX_RULE_MEMS>5)
+#error MAX_RULE_MEMS is bigger than 5
 #endif
-uint8_t vars_event = 0;
+uint16_t vars_event = 0;
 uint8_t mems_event = 0;
 
 /*******************************************************************************************/