diff --git a/src/libavrdude.h b/src/libavrdude.h
index 43bdebfb..09f0966d 100644
--- a/src/libavrdude.h
+++ b/src/libavrdude.h
@@ -433,7 +433,7 @@ enum {
 #ifdef HAVE_LINUXGPIO
 /* Embedded systems might have a lot more gpio than only 0-31 */
 #undef PIN_MAX
-#define PIN_MAX     400 /* largest allowed pin number */
+#define PIN_MAX     1000 /* largest allowed pin number */
 #endif
 
 /** Number of pins in each element of the bitfield */