diff --git a/shiny/003-play-golf/app.R b/shiny/003-play-golf/app.R
index 3715ade..289b39d 100644
--- a/shiny/003-play-golf/app.R
+++ b/shiny/003-play-golf/app.R
@@ -14,6 +14,8 @@ library(randomForest)
 
 # Read data
 weather <- read.csv(text = getURL("https://raw.githubusercontent.com/dataprofessor/data/master/weather-weka.csv") )
+weather$play = factor(weather$play) 
+weather$outlook = factor(weather$outlook)
 
 # Build model
 model <- randomForest(play ~ ., data = weather, ntree = 500, mtry = 4, importance = TRUE)