diff --git a/Arduino/CanGrow/include/Webserver/Page_system.h b/Arduino/CanGrow/include/Webserver/Page_system.h
index 8c5eb98..06751e3 100644
--- a/Arduino/CanGrow/include/Webserver/Page_system.h
+++ b/Arduino/CanGrow/include/Webserver/Page_system.h
@@ -371,11 +371,13 @@ String Proc_WebPage_system_output_add(const String& var) {
     String gpioIndex_html;
     // iterate through through all available GPIOs in index
     for(byte i = 0; i < GPIOindex_length; i++) {
+      bool gpioUsed = Check_GPIOindex_Used(i);
+      
       gpioIndex_html += "<option value='";
       gpioIndex_html += i;
       gpioIndex_html += "'";
       // set disabled option for gpio which are already in use or incompatible
-      if((Check_GPIOindex_Used(i) == true) || (GPIOindex[i].note == INPUT_ONLY)) {
+      if((gpioUsed == true) || (GPIOindex[i].note == INPUT_ONLY)) {
         gpioIndex_html += " disabled";
       }
       gpioIndex_html += ">GPIO ";
@@ -389,7 +391,7 @@ String Proc_WebPage_system_output_add(const String& var) {
       if(GPIOindex[i].note == INPUT_ONLY) {
         gpioIndex_html += " (N/A)";
       // add USED if gpio is already in use  
-      } else if(Check_GPIOindex_Used(i) == true) {
+      } else if(gpioUsed == true) {
         gpioIndex_html += " (used)";
       }
       gpioIndex_html += "</option>";