diff --git a/lib/roken/strlwr.c b/lib/roken/strlwr.c
index af49749cb..4b39e9c2b 100644
--- a/lib/roken/strlwr.c
+++ b/lib/roken/strlwr.c
@@ -43,6 +43,8 @@ RCSID("$Id$");
 #include <string.h>
 #include <ctype.h>
 
+#include <roken.h>
+
 #ifndef HAVE_STRLWR
 char *
 strlwr(char *str)
diff --git a/lib/roken/strupr.c b/lib/roken/strupr.c
index 6d1a28577..96706631b 100644
--- a/lib/roken/strupr.c
+++ b/lib/roken/strupr.c
@@ -43,6 +43,8 @@ RCSID("$Id$");
 #include <string.h>
 #include <ctype.h>
 
+#include <roken.h>
+
 #ifndef HAVE_STRUPR
 char *
 strupr(char *str)