diff --git a/src/misc_gui.cpp b/src/misc_gui.cpp
--- a/src/misc_gui.cpp
+++ b/src/misc_gui.cpp
@@ -794,7 +794,7 @@ void QueryString::DrawEditBox(const Wind
 
 	DrawFrameRect(cr, wi->colour, wi->IsLowered() ? FR_LOWERED : FR_NONE);
 	DrawSpriteIgnorePadding(rtl ? SPR_IMG_DELETE_RIGHT : SPR_IMG_DELETE_LEFT, PAL_NONE, cr, SA_CENTER);
-	if (this->text.bytes == 1) GfxFillRect(cr.Shrink(WidgetDimensions::scaled.bevel), _colour_gradient[wi->colour & 0xF][2], FILLRECT_CHECKER);
+	if (this->text.bytes == 1) GfxFillRect(cr.Shrink(WidgetDimensions::scaled.bevel), GetColourGradient(wi->colour, 2), FILLRECT_CHECKER);
 
 	DrawFrameRect(fr, wi->colour, FR_LOWERED | FR_DARKENED);
 	GfxFillRect(fr.Shrink(WidgetDimensions::scaled.bevel), PC_BLACK);