diff --git a/lib/strlcpy.c b/lib/strlcpy.c
index fab04fed..ffb83e0c 100644
--- a/lib/strlcpy.c
+++ b/lib/strlcpy.c
@@ -6,10 +6,13 @@
 
 #include <config.h>
 
+#include <stddef.h>
+#include <sys/types.h>
+
 #ident "$Id$"
 
 #include "strlcpy.h"
 
 
-extern inline size_t strlcpy_(char *restrict dst, const char *restrict src,
+extern inline ssize_t strlcpy_(char *restrict dst, const char *restrict src,
     size_t size);
diff --git a/lib/strlcpy.h b/lib/strlcpy.h
index e725078b..c44819c6 100644
--- a/lib/strlcpy.h
+++ b/lib/strlcpy.h
@@ -12,6 +12,7 @@
 
 #include <stddef.h>
 #include <string.h>
+#include <sys/types.h>
 
 #include "sizeof.h"
 
@@ -45,11 +46,11 @@
 #define STRLCPY(dst, src)  strlcpy_(dst, src, SIZEOF_ARRAY(dst))
 
 
-inline size_t strlcpy_(char *restrict dst, const char *restrict src,
+inline ssize_t strlcpy_(char *restrict dst, const char *restrict src,
     size_t size);
 
 
-inline size_t
+inline ssize_t
 strlcpy_(char *restrict dst, const char *restrict src, size_t size)
 {
 	size_t  len;