diff --git a/appl/login/login.c b/appl/login/login.c
index a78e9067a..3b6dfcf9c 100644
--- a/appl/login/login.c
+++ b/appl/login/login.c
@@ -38,6 +38,9 @@
 #ifdef HAVE_SYS_CAPABILITY_H
 #include <sys/capability.h>
 #endif
+#ifdef HAVE_CRYPT_H
+#include <crypt.h>
+#endif
 
 RCSID("$Id$");
 
diff --git a/appl/popper/pop_pass.c b/appl/popper/pop_pass.c
index 4d0142b5d..d3bb25cfc 100644
--- a/appl/popper/pop_pass.c
+++ b/appl/popper/pop_pass.c
@@ -5,6 +5,10 @@
  */
 
 #include <popper.h>
+#ifdef HAVE_CRYPT_H
+#include <crypt.h>
+#endif
+
 RCSID("$Id$");
 
 #ifdef KRB4
diff --git a/appl/su/su.c b/appl/su/su.c
index 112ebde6c..530869e06 100644
--- a/appl/su/su.c
+++ b/appl/su/su.c
@@ -49,6 +49,9 @@ RCSID("$Id$");
 #endif
 
 #include <pwd.h>
+#ifdef HAVE_CRYPT_H
+#include <crypt.h>
+#endif
 
 #include "crypto-headers.h"
 #ifdef KRB5