diff --git a/src/atoms/second_order_cone/power_to_socp.jl b/src/atoms/second_order_cone/power_to_socp.jl
index eb00f859f..9a16594f9 100644
--- a/src/atoms/second_order_cone/power_to_socp.jl
+++ b/src/atoms/second_order_cone/power_to_socp.jl
@@ -38,7 +38,7 @@ mutable struct InequalityExpression
   u_var_ind::Int
 end
 
-mutable struct SimpleInequalityExpression
+struct SimpleInequalityExpression
   # Represents an inequality of the form
   #
   # x^2 <= t s,