diff --git a/src/hb-array.hh b/src/hb-array.hh
index c89bb3c6a..8758558c8 100644
--- a/src/hb-array.hh
+++ b/src/hb-array.hh
@@ -453,7 +453,7 @@ inline uint32_t hb_array_t<const char>::hash () const
     ((defined(__GNUC__) && __GNUC__ >= 5) || defined(__clang__))
   struct __attribute__((packed)) packed_uint32_t { uint32_t v; };
   for (; i + 4 <= this->length; i += 4)
-    current = current * 31 + hb_hash (((packed_uint32_t *) &this->arrayZ[i])->v);
+    current = current * 31 + hb_hash ((uint32_t) ((packed_uint32_t *) &this->arrayZ[i])->v);
 #endif
 
   for (; i < this->length; i++)
@@ -471,7 +471,7 @@ inline uint32_t hb_array_t<const unsigned char>::hash () const
     ((defined(__GNUC__) && __GNUC__ >= 5) || defined(__clang__))
   struct __attribute__((packed)) packed_uint32_t { uint32_t v; };
   for (; i + 4 <= this->length; i += 4)
-    current = current * 31 + hb_hash (((packed_uint32_t *) &this->arrayZ[i])->v);
+    current = current * 31 + hb_hash ((uint32_t) ((packed_uint32_t *) &this->arrayZ[i])->v);
 #endif
 
   for (; i < this->length; i++)