diff --git a/src/include/types.h b/src/include/types.h
index 6eda961a429ebaa1a149ebb700cdea2d5ef69e4e..8c6ab4b214a0e8cfe10c07f3d8b7823897b73533 100644
--- a/src/include/types.h
+++ b/src/include/types.h
@@ -14,6 +14,9 @@ typedef __complex__ double dcomplex;
 
 #ifdef USE_LAPACK
 #ifdef USE_MKL
+#ifndef MKL_INT 
+#define MKL_INT int64_t
+#endif
 #include <mkl_lapacke.h>
 #else
 #include <lapacke.h>