diff --git a/appl/gssmask/common.h b/appl/gssmask/common.h
index f498ed2a2..4ec696968 100644
--- a/appl/gssmask/common.h
+++ b/appl/gssmask/common.h
@@ -38,6 +38,9 @@
 #endif
 
 #include <sys/param.h>
+#ifdef HAVE_SYS_UTSNAME_H
+#include <sys/utsname.h>
+#endif
 
 #include <krb5.h>
 #include <gssapi.h>