1 files changed, 1 insertions, 0 deletions
diff --git a/matrix.h b/matrix.h
index 5c58d72..ac95570 100644
--- a/matrix.h
+++ b/matrix.h
@@ -2,6 +2,7 @@
 #define MATRIX_H
 
 #include <stddef.h>
+#include <stdbool.h>
 
 #define matrix_at(mat, i, j) ((mat)->xs[(i) * (mat)->n + (j)])