diff --git a/src/config.h.in b/src/config.h.in
index ba8ea21..3e1a955 100644
--- a/src/config.h.in
+++ b/src/config.h.in
@@ -543,6 +543,10 @@ extern char __mx_opts[];
 #define INT_MAX				((int)(((unsigned int)-3) >> 1))
 #endif
 
+#ifndef PATH_MAX
+#define PATH_MAX    4096
+#endif
+
 #define	TIME_MAX	2147483647
 
 /*