diff --git a/src/hll/StoatSpriteEngine.c b/src/hll/StoatSpriteEngine.c
index c4b0c4e..6ccc647 100644
--- a/src/hll/StoatSpriteEngine.c
+++ b/src/hll/StoatSpriteEngine.c
@@ -132,6 +132,8 @@ void StoatSpriteEngine_SP_SetTextSpriteType(int type)
 
 void StoatSpriteEngine_SP_SetTextSpriteSize(int size)
 {
+	if (text_sprite_ts.size != size)
+		text_sprite_ts.font_size = NULL;
 	text_sprite_ts.size = size;
 }