diff --git a/src/openrct2/windows/dropdown.c b/src/openrct2/windows/dropdown.c
index 9ecdfd31ef..e25b6c12a8 100644
--- a/src/openrct2/windows/dropdown.c
+++ b/src/openrct2/windows/dropdown.c
@@ -46,8 +46,8 @@ sint32 _dropdown_item_width;
 sint32 _dropdown_item_height;
 
 sint32 gDropdownNumItems;
-rct_string_id gDropdownItemsFormat[64];
-sint64 gDropdownItemsArgs[64];
+rct_string_id gDropdownItemsFormat[DROPDOWN_ITEMS_MAX_SIZE];
+sint64 gDropdownItemsArgs[DROPDOWN_ITEMS_MAX_SIZE];
 uint64 gDropdownItemsChecked;
 uint64 gDropdownItemsDisabled;
 bool gDropdownIsColour;
@@ -337,7 +337,7 @@ static void window_dropdown_paint(rct_window *w, rct_drawpixelinfo *dpi)
                 );
             } else {
                 // Text item
-                if (i < 64) {
+                if (i < DROPDOWN_ITEMS_MAX_SIZE) {
                     if (dropdown_is_checked(i)) {
                         item++;
                     }
@@ -348,7 +348,7 @@ static void window_dropdown_paint(rct_window *w, rct_drawpixelinfo *dpi)
                 if (i == highlightedIndex)
                     colour = COLOUR_WHITE;
                 if (dropdown_is_disabled(i))
-                    if (i < 64)
+                    if (i < DROPDOWN_ITEMS_MAX_SIZE)
                         colour = NOT_TRANSLUCENT(w->colours[0]) | COLOUR_FLAG_INSET;
 
                 // Draw item string
diff --git a/src/openrct2/windows/dropdown.h b/src/openrct2/windows/dropdown.h
index e0160709e2..68898c7911 100644
--- a/src/openrct2/windows/dropdown.h
+++ b/src/openrct2/windows/dropdown.h
@@ -23,6 +23,7 @@
 #define DROPDOWN_SEPARATOR            0
 #define DROPDOWN_FORMAT_COLOUR_PICKER 0xFFFE
 #define DROPDOWN_FORMAT_LAND_PICKER   0xFFFF
+#define DROPDOWN_ITEMS_MAX_SIZE       64
 
 enum
 {
@@ -33,8 +34,8 @@ enum
 extern sint32 gAppropriateImageDropdownItemsPerRow[];
 
 extern sint32 gDropdownNumItems;
-extern rct_string_id gDropdownItemsFormat[64];
-extern sint64 gDropdownItemsArgs[64];
+extern rct_string_id gDropdownItemsFormat[DROPDOWN_ITEMS_MAX_SIZE];
+extern sint64 gDropdownItemsArgs[DROPDOWN_ITEMS_MAX_SIZE];
 extern uint64 gDropdownItemsChecked;
 extern uint64 gDropdownItemsDisabled;
 extern bool gDropdownIsColour;