diff --git a/ndn-cpp/c/util/dynamic-uchar-array.h b/ndn-cpp/c/util/dynamic-uchar-array.h
index 71b6a2e..ab5dca4 100644
--- a/ndn-cpp/c/util/dynamic-uchar-array.h
+++ b/ndn-cpp/c/util/dynamic-uchar-array.h
@@ -75,7 +75,7 @@
   (struct ndn_DynamicUCharArray *self, unsigned char *value, unsigned int valueLength, unsigned int offset) 
 {
   ndn_Error error;
-  if (error = ndn_DynamicUCharArray_ensureLength(self, valueLength + offset))
+  if ((error = ndn_DynamicUCharArray_ensureLength(self, valueLength + offset)))
     return error;
   ndn_memcpy(self->array + offset, value, valueLength);
 };