diff --git a/modules/redis/variables.tf b/modules/redis/variables.tf
index 77900da..a5d2b8c 100644
--- a/modules/redis/variables.tf
+++ b/modules/redis/variables.tf
@@ -176,7 +176,7 @@ variable "memory_io_enabled" {
 }
 variable "memory_io_over_period" {
   default     = null
-  type        = number
+  type        = string
   description = "Auto Scaling Memory Scalar: IO Utilization Over Period"
 }
 variable "memory_rate_increase_percent" {
@@ -198,4 +198,4 @@ variable "memory_rate_units" {
   default     = null
   type        = string
   description = "Auto Scaling Memory Rate: Units "
-}
\ No newline at end of file
+}