diff --git a/Code/Day 1_Data_Preprocessing.md b/Code/Day 1_Data_Preprocessing.md
index d4d200c..00546ce 100644
--- a/Code/Day 1_Data_Preprocessing.md	
+++ b/Code/Day 1_Data_Preprocessing.md	
@@ -49,5 +49,5 @@ X_train, X_test, Y_train, Y_test = train_test_split( X , Y , test_size = 0.2, ra
 from sklearn.preprocessing import StandardScaler
 sc_X = StandardScaler()
 X_train = sc_X.fit_transform(X_train)
-X_test = sc_X.fit_transform(X_test)
+X_test = sc_X.transform(X_test)
 ```
diff --git a/Code/Day 1_Data_Preprocessing.py b/Code/Day 1_Data_Preprocessing.py
index b2a6117..39776f0 100644
--- a/Code/Day 1_Data_Preprocessing.py	
+++ b/Code/Day 1_Data_Preprocessing.py	
@@ -59,7 +59,7 @@ print(Y_test)
 from sklearn.preprocessing import StandardScaler
 sc_X = StandardScaler()
 X_train = sc_X.fit_transform(X_train)
-X_test = sc_X.fit_transform(X_test)
+X_test = sc_X.transform(X_test)
 print("---------------------")
 print("Step 6: Feature Scaling")
 print("X_train")