diff --git a/CHANGES b/CHANGES
index e6c0bd6..4a5cefa 100644
--- a/CHANGES
+++ b/CHANGES
@@ -5,6 +5,9 @@ corrections:
 	Failing name resolution could lead to SIGSEGV
 	Thanks to Max for reporting this issue.
 
+	Include <stddef.h> for ptrdiff_t
+	Thanks to Jeroen Roovers for reporting this issue.
+
 testing:
 	socks4echo.sh and socks4a-echo.sh hung with new bash with read -n
 
diff --git a/sysincludes.h b/sysincludes.h
index dfc86ca..afcedd3 100644
--- a/sysincludes.h
+++ b/sysincludes.h
@@ -5,6 +5,7 @@
 #ifndef __sysincludes_h_included
 #define __sysincludes_h_included 1
 
+#include <stddef.h>	/* ptrdiff_t */
 #if HAVE_STDBOOL_H
 #include <stdbool.h>	/* bool, true, false */
 #endif