diff --git a/include/nfc/nfc-types.h b/include/nfc/nfc-types.h
index a18e4aaf..89ad3978 100644
--- a/include/nfc/nfc-types.h
+++ b/include/nfc/nfc-types.h
@@ -311,7 +311,7 @@ typedef enum {
   NMT_ISO14443B2SR, // ISO14443-2B ST SRx
   NMT_ISO14443B2CT, // ISO14443-2B ASK CTx
   NMT_FELICA,
-  NMT_DEP,
+  NMT_DEP,        // DEP should be kept last one as it's used as end-of-enum
 } nfc_modulation_type;
 
 /**
diff --git a/libnfc/chips/pn53x.c b/libnfc/chips/pn53x.c
index 5c197674..03642486 100644
--- a/libnfc/chips/pn53x.c
+++ b/libnfc/chips/pn53x.c
@@ -85,7 +85,7 @@ pn53x_init(struct nfc_device *pnd)
   }
 
   if (!CHIP_DATA(pnd)->supported_modulation_as_initiator) {
-    CHIP_DATA(pnd)->supported_modulation_as_initiator = malloc(sizeof(nfc_modulation_type) * 9);
+    CHIP_DATA(pnd)->supported_modulation_as_initiator = malloc(sizeof(nfc_modulation_type) * (NMT_DEP + 1));
     if (! CHIP_DATA(pnd)->supported_modulation_as_initiator)
       return NFC_ESOFT;
     int nbSupportedModulation = 0;