diff --git a/validate.hpp b/validate.hpp
index 8555f0e..cc6daca 100644
--- a/validate.hpp
+++ b/validate.hpp
@@ -52,7 +52,7 @@ string format_guess(vector<int> guess) {
 
 string format_guess_history(vector<int> sequence, vector<int> guess) {
 	vector<string> r(sequence.size());
-	int N = sequence.size()
+	int N = sequence.size();
 	// Find correct values
 	for(int i = 0; i < N; i++) {
 		if(sequence[i] == guess[i]) {