diff --git a/exprtkTools.hpp b/exprtkTools.hpp
index 394053f..d712ef9 100644
--- a/exprtkTools.hpp
+++ b/exprtkTools.hpp
@@ -31,7 +31,6 @@
 #define exprtk_disable_string_capabilities
 
 #define exprtk_disable_rtl_io_file
-#define exprtk_disable_rtl_vecops
 #define exprtk_disable_return_statement
 #define exprtk_disable_rtl_io
 #define exprtk_disable_superscalar_unroll
diff --git a/virtualSensor.cpp b/virtualSensor.cpp
index ce429f6..25c127c 100644
--- a/virtualSensor.cpp
+++ b/virtualSensor.cpp
@@ -154,6 +154,7 @@
     }
 
     symbols.add_constants();
+    symbols.add_package(vecopsPackage);
     expression.register_symbol_table(symbols);
 
     /* parser from exprtk */
diff --git a/virtualSensor.hpp b/virtualSensor.hpp
index e39f8d9..a04a743 100644
--- a/virtualSensor.hpp
+++ b/virtualSensor.hpp
@@ -116,6 +116,8 @@
     exprtk::symbol_table<double> symbols{};
     /** @brief expression from exprtk to calculate sensor value */
     exprtk::expression<double> expression{};
+    /** @brief The vecops package so the expression can use vectors */
+    exprtk::rtl::vecops::package<double> vecopsPackage;
 
     /** @brief Read config from json object and initialize sensor data
      * for each virtual sensor