diff --git a/src/flash/nor/at91sam3.c b/src/flash/nor/at91sam3.c
index 8b922f3a7..b8789a3cb 100644
--- a/src/flash/nor/at91sam3.c
+++ b/src/flash/nor/at91sam3.c
@@ -98,7 +98,7 @@
 #define  offset_EFC_FRR   12
 
 
-struct flash_driver at91sam3_flash;
+extern struct flash_driver at91sam3_flash;
 
 static float
 _tomhz(uint32_t freq_hz)