diff --git a/ETL/ETL.h b/ETL/ETL.h
index 58e42ee..f7a75f8 100644
--- a/ETL/ETL.h
+++ b/ETL/ETL.h
@@ -4,6 +4,7 @@
 #include <iostream>
 #include <fstream>
 #include <eigen3/Eigen/Dense>
+#include <vector>
 
 class ETL
 {
@@ -29,4 +30,4 @@ class ETL
     void EigentoFile(Eigen::MatrixXd data, std::string filename);
 };
 
-#endif
\ No newline at end of file
+#endif
diff --git a/LinearRegression/LinearRegression.h b/LinearRegression/LinearRegression.h
index e4f8b17..4e3bf8d 100644
--- a/LinearRegression/LinearRegression.h
+++ b/LinearRegression/LinearRegression.h
@@ -2,6 +2,7 @@
 #define LinearRegression_h
 
 #include <eigen3/Eigen/Dense>
+#include <vector>
 
 class LinearRegression
 {
@@ -15,4 +16,4 @@ class LinearRegression
     float RSquared(Eigen::MatrixXd y, Eigen::MatrixXd y_hat);
 };
 
-#endif
\ No newline at end of file
+#endif