diff --git a/frame/include/bli_type_defs.h b/frame/include/bli_type_defs.h
index 95b7c6c0e..b058fa0e8 100644
--- a/frame/include/bli_type_defs.h
+++ b/frame/include/bli_type_defs.h
@@ -571,8 +571,8 @@ typedef struct
 
 	// Pointers to the micro-panels of A and B which will be used by the
 	// next call to the micro-kernel.
-	void*  a_next;
-	void*  b_next;
+	const void*  a_next;
+	const void*  b_next;
 
 	// The imaginary strides of A and B.
 	inc_t  is_a;