diff --git a/src/calc.c b/src/calc.c
index 1d877a5..ffc251f 100644
--- a/src/calc.c
+++ b/src/calc.c
@@ -30,7 +30,8 @@ char current_code_text[SMAX_LENGTH] = "";
 char displayed_code[SMAX_LENGTH] = "";
 
 // The result of execution
-char result_text[RESULT_LENGTH] = "";
+#define RESULT_PREFIX "R:"
+char result_text[RESULT_LENGTH] = RESULT_PREFIX;
 
 const char *tokens[] = {
     " ", "(", ")",
@@ -207,7 +208,7 @@ static void calculate()
     char temp[RESULT_LENGTH-2] = "";
 
     stringObj(temp, &obj);
-    snprintf(result_text, RESULT_LENGTH, "R:%s", temp);
+    snprintf(result_text, RESULT_LENGTH, RESULT_PREFIX "%s", temp);
     text_layer_set_text(s_result_text_layer, result_text);
 }
 
@@ -277,7 +278,7 @@ static void code_window_load(Window *window)
     // Result text layer setup
     GRect result_bounds = GRect(6, 148, 132, 132);
     s_result_text_layer = text_layer_create(result_bounds);
-    text_layer_set_text(s_result_text_layer, "R: ");
+    text_layer_set_text(s_result_text_layer, result_text);
     text_layer_set_font(s_result_text_layer, fonts_get_system_font(FONT_KEY_GOTHIC_18_BOLD));
     text_layer_set_text_alignment(s_result_text_layer, GTextAlignmentRight);
     layer_add_child(window_get_root_layer(s_code_window), text_layer_get_layer(s_result_text_layer));
@@ -422,7 +423,7 @@ static void custom_load(Window *window)
     window_stack_push(s_custom_window, true);
 }
 
-Object add_window(Object obj1, Object obj2, struct Environment *env)
+Object add_window(Object obj1, Object _, struct Environment *env)
 {
     printf("ADD_WINDOW\n");
     if(obj1.type == TYPE_STRING) {