diff --git a/openmp/lab3/matmul.c b/openmp/lab3/matmul.c
index 8f9f47f..5a510df 100644
--- a/openmp/lab3/matmul.c
+++ b/openmp/lab3/matmul.c
@@ -4,6 +4,8 @@
 #include <time.h>
 #include <omp.h>
 
+#include "utils.h"
+
 #ifndef N
 #define N (1 << 10)
 #endif