diff --git a/targets/TARGET_ARM_SSG/TARGET_MUSCA_B1/pinmap_ns.c b/targets/TARGET_ARM_SSG/TARGET_MUSCA_B1/pinmap_ns.c
index 7c3987903c..6e76089d8d 100644
--- a/targets/TARGET_ARM_SSG/TARGET_MUSCA_B1/pinmap_ns.c
+++ b/targets/TARGET_ARM_SSG/TARGET_MUSCA_B1/pinmap_ns.c
@@ -34,12 +34,14 @@
 
 const PinMap PinMap_I2C_SDA[] = {
     {I2C0_SDA, I2C_0, ALTERNATE_FUNC_1},
-    {I2C1_SDA, I2C_1, PRIMARY_FUNC}
+    {I2C1_SDA, I2C_1, PRIMARY_FUNC},
+    {NC,       NC,    0}
 };
 
 const PinMap PinMap_I2C_SCL[] = {
     {I2C0_SCL, I2C_0, ALTERNATE_FUNC_1},
-    {I2C1_SCL, I2C_1, PRIMARY_FUNC}
+    {I2C1_SCL, I2C_1, PRIMARY_FUNC},
+    {NC,       NC,    0}
 };
 
 /**