diff --git a/appl/telnet/telnet/Makefile.am b/appl/telnet/telnet/Makefile.am
index 6c1f40319..e3c5a7ff5 100644
--- a/appl/telnet/telnet/Makefile.am
+++ b/appl/telnet/telnet/Makefile.am
@@ -2,7 +2,7 @@
 
 include $(top_srcdir)/Makefile.am.common
 
-INCLUDES += -I$(srcdir)/.. $(INCLUDE_krb4)
+INCLUDES += -I$(srcdir)/.. $(INCLUDE_krb4) $(INCLUDE_des)
 
 bin_PROGRAMS = telnet
 
diff --git a/appl/telnet/telnetd/Makefile.am b/appl/telnet/telnetd/Makefile.am
index 0b22b42d0..24f3b758c 100644
--- a/appl/telnet/telnetd/Makefile.am
+++ b/appl/telnet/telnetd/Makefile.am
@@ -2,7 +2,7 @@
 
 include $(top_srcdir)/Makefile.am.common
 
-INCLUDES += -I$(srcdir)/.. $(INCLUDE_krb4)
+INCLUDES += -I$(srcdir)/.. $(INCLUDE_krb4) $(INCLUDE_des)
 
 libexec_PROGRAMS = telnetd
 
diff --git a/lib/gssapi/Makefile.am b/lib/gssapi/Makefile.am
index 2872dac5f..fbc8cc1b6 100644
--- a/lib/gssapi/Makefile.am
+++ b/lib/gssapi/Makefile.am
@@ -2,7 +2,7 @@
 
 include $(top_srcdir)/Makefile.am.common
 
-INCLUDES += -I$(srcdir)/../krb5 $(INCLUDE_krb4)
+INCLUDES += -I$(srcdir)/../krb5 $(INCLUDE_des) $(INCLUDE_krb4)
 
 lib_LTLIBRARIES = libgssapi.la
 libgssapi_la_LDFLAGS = -version-info 3:4:2
diff --git a/lib/gssapi/krb5/Makefile.am b/lib/gssapi/krb5/Makefile.am
index 2872dac5f..fbc8cc1b6 100644
--- a/lib/gssapi/krb5/Makefile.am
+++ b/lib/gssapi/krb5/Makefile.am
@@ -2,7 +2,7 @@
 
 include $(top_srcdir)/Makefile.am.common
 
-INCLUDES += -I$(srcdir)/../krb5 $(INCLUDE_krb4)
+INCLUDES += -I$(srcdir)/../krb5 $(INCLUDE_des) $(INCLUDE_krb4)
 
 lib_LTLIBRARIES = libgssapi.la
 libgssapi_la_LDFLAGS = -version-info 3:4:2