diff --git a/src/hll/StoatSpriteEngine.c b/src/hll/StoatSpriteEngine.c
index 6fb8f85..c30693d 100644
--- a/src/hll/StoatSpriteEngine.c
+++ b/src/hll/StoatSpriteEngine.c
@@ -127,6 +127,8 @@ bool StoatSpriteEngine_SP_SetTextSprite(int sp_no, struct string *text)
 
 void StoatSpriteEngine_SP_SetTextSpriteType(int type)
 {
+	if (text_sprite_ts.face != type)
+		text_sprite_ts.font_size = NULL;
 	text_sprite_ts.face = type;
 }