diff --git a/src/maths/sparse/spdefs.h b/src/maths/sparse/spdefs.h
index e9eb0375b..0894c3f41 100644
--- a/src/maths/sparse/spdefs.h
+++ b/src/maths/sparse/spdefs.h
@@ -52,8 +52,7 @@
 
 /* Begin macros. */
 
-/* Boolean data type */
-#define  bool        int
+/* Boolean data type by stdbool.h */
 #define  NO             0
 #define  YES            1