1 files changed, 4 insertions, 2 deletions
diff --git a/ice40/chip.h b/ice40/chip.h
index 3ab3f3d2..451be9ce 100644
--- a/ice40/chip.h
+++ b/ice40/chip.h
@@ -17,11 +17,13 @@
  *
  */
 
-#include "design.h"
-
 #ifndef CHIP_H
 #define CHIP_H
 
+#ifndef NEXTPNR_H
+#error Include "chip.h" via "nextpnr.h" only.
+#endif
+
 struct DelayInfo
 {
     float delay = 0;