1 files changed, 2 insertions, 0 deletions
diff --git a/double-error.h b/double-error.h
index bacc8e7..84d118a 100644
--- a/double-error.h
+++ b/double-error.h
@@ -1,3 +1,5 @@
+#include <stdbool.h>
+
 typedef struct {double v; double e;} double_error;
 
 double_error int_to_valuetype(int);