diff --git a/prtconf-1.3/eeprom.c b/prtconf-1.3/eeprom.c
index b801f95..b15e74c 100644
--- a/prtconf-1.3/eeprom.c
+++ b/prtconf-1.3/eeprom.c
@@ -33,4 +33,6 @@
 #include <dirent.h>
 #include <pwd.h>
+#include <ctype.h> /* isdigit() */
+#include <sys/ioctl.h> /* ioctl() */
 
 #include <asm/openpromio.h>
diff --git a/prtconf-1.3/prtconf.c b/prtconf-1.3/prtconf.c
index b9d8c89..c9b54be 100644
--- a/prtconf-1.3/prtconf.c
+++ b/prtconf-1.3/prtconf.c
@@ -30,4 +30,5 @@
 #include <sys/stat.h>
 #include <sys/utsname.h>
+#include <sys/ioctl.h> /* ioctl() */
 
 #include <asm/openpromio.h>