diff --git a/appl/xnlock/xnlock.c b/appl/xnlock/xnlock.c
index 2d44cec7f..b0c6c1cea 100644
--- a/appl/xnlock/xnlock.c
+++ b/appl/xnlock/xnlock.c
@@ -22,6 +22,9 @@ RCSID("$Id$");
 #include <X11/Shell.h>
 #include <X11/Xos.h>
 #include <ctype.h>
+#ifdef HAVE_SYS_TYPES_H
+#include <sys/types.h>
+#endif
 #ifdef HAVE_PWD_H
 #include <pwd.h>
 #endif
diff --git a/lib/auth/afskauthlib/verify.c b/lib/auth/afskauthlib/verify.c
index 3ffbeecc4..d0135e61e 100644
--- a/lib/auth/afskauthlib/verify.c
+++ b/lib/auth/afskauthlib/verify.c
@@ -41,6 +41,7 @@
 RCSID("$Id$");
 #endif
 #include <unistd.h>
+#include <sys/types.h>
 #include <pwd.h>
 #include <krb.h>
 #include <kafs.h>
diff --git a/lib/auth/pam/pam.c b/lib/auth/pam/pam.c
index fd5a7b85a..e845a729c 100644
--- a/lib/auth/pam/pam.c
+++ b/lib/auth/pam/pam.c
@@ -50,6 +50,7 @@ RCSID("$Id$");
 #include <string.h>
 #include <pwd.h>
 #include <unistd.h>
+#include <sys/types.h>
 
 #define PAM_SM_AUTH
 #define PAM_SM_SESSION
diff --git a/lib/kafs/afssys.c b/lib/kafs/afssys.c
index c4e949f20..c25d48d0e 100644
--- a/lib/kafs/afssys.c
+++ b/lib/kafs/afssys.c
@@ -49,6 +49,9 @@ RCSID("$Id$");
 #ifdef HAVE_UNISTD_H
 #include <unistd.h>
 #endif
+#ifdef HAVE_SYS_TYPES_H
+#include <sys/types.h>
+#endif
 #ifdef HAVE_SYS_IOCTL_H
 #include <sys/ioctl.h>
 #endif