diff --git a/cpu/sam3/periph/gpio.c b/cpu/sam3/periph/gpio.c
index c096642d6d..ebe7d73a24 100644
--- a/cpu/sam3/periph/gpio.c
+++ b/cpu/sam3/periph/gpio.c
@@ -53,7 +53,7 @@
 /**
  * @brief Allocation of memory for 7 independent interrupt slots
  */
-static gpio_isr_ctx_t exti_ctx[CTX_NUMOF] = {{0}};
+static gpio_isr_ctx_t exti_ctx[CTX_NUMOF];
 
 /**
  * @brief Allocation of 4 bit per pin to map a pin to an interrupt context