diff --git a/openbsd-compat/openbsd-compat.h b/openbsd-compat/openbsd-compat.h
index f5c833bf2..865aaee53 100644
--- a/openbsd-compat/openbsd-compat.h
+++ b/openbsd-compat/openbsd-compat.h
@@ -61,6 +61,7 @@ void closefrom(int);
 #endif
 
 #ifndef HAVE_GETLINE
+#include <stdio.h>
 ssize_t getline(char **, size_t *, FILE *);
 #endif