diff --git a/internal/theme/theme.go b/internal/theme/theme.go
index 2357c09..4c45e41 100644
--- a/internal/theme/theme.go
+++ b/internal/theme/theme.go
@@ -25,7 +25,7 @@ type Theme struct {
 	Rules map[theme.Role] Rule
 
 	// Colors maps theme.Color values to color.RGBA values.
-	Colors map[theme.Color] color.RGBA
+	Colors map[theme.Color] color.Color
 
 	// This type does not handle icons, and as such, a special icon theme
 	// must be separately specified.