diff --git a/libiberty/ChangeLog b/libiberty/ChangeLog
index 22d2238965b..8598b292567 100644
--- a/libiberty/ChangeLog
+++ b/libiberty/ChangeLog
@@ -1,3 +1,7 @@
+2001-06-18  Richard Henderson  <rth@redhat.com>
+
+	* concat.c: Include <sys/types.h>.
+
 2001-06-11  Loren J. Rittle  <ljrittle@acm.org>
 
 	bootstrap/3106
diff --git a/libiberty/concat.c b/libiberty/concat.c
index 8e6838f1cd8..2e0ce4996e7 100644
--- a/libiberty/concat.c
+++ b/libiberty/concat.c
@@ -55,6 +55,7 @@ NOTES
 
 #include "ansidecl.h"
 #include "libiberty.h"
+#include <sys/types.h>		/* size_t */
 
 #ifdef ANSI_PROTOTYPES
 #include <stdarg.h>