diff --git a/cpu/samd21/periph/gpio.c b/cpu/samd21/periph/gpio.c
index f92bf170c4..b35ae79ab0 100644
--- a/cpu/samd21/periph/gpio.c
+++ b/cpu/samd21/periph/gpio.c
@@ -41,10 +41,17 @@
  * @brief   Mapping of pins to EXTI lines, -1 means not EXTI possible
  */
 static const int8_t exti_config[2][32] = {
+#ifdef CPU_MODEL_SAMD21J18A
     { 0,  1,  2,  3,  4,  5,  6,  7, -1,  9, 10, 11, 12, 13, 14, 15,
       0,  1,  2,  3,  4,  5,  6,  7, 12, 13, -1, 15,  8, -1, 10, 11},
     { 0,  1,  2,  3,  4,  5,  6,  7,  8,  9, 10, 11, 12, 13, 14, 15,
       0,  1, -1, -1, -1, -1,  6,  7, -1, -1, -1, -1, -1, -1, 14, 15},
+#elif CPU_MODEL_SAMR21G18A
+    {-1,  1, -1, -1,  4,  5,  6,  7, -1,  9, 10, 11, 12, 13, 14, 15,
+     -1,  1,  2,  3, -1, -1,  6,  7, 12, 13, -1, 15,  8, -1, 10, 11},
+    { 0, -1,  2,  3, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
+      0,  1, -1, -1, -1, -1,  6,  7, -1, -1, -1, -1,  8, -1, -1, -1},
+#endif
 };
 
 /**