diff --git a/src/common_io.h b/src/common_io.h
index 52629172d890433652400778c491f186ac918820..7aedee0f2624dcff916a8398e244009a87109915 100644
--- a/src/common_io.h
+++ b/src/common_io.h
@@ -62,8 +62,8 @@ enum PARTICLE_TYPE {
 extern const char* particle_type_names[];
 
 #define FILENAME_BUFFER_SIZE 150
-#define FIELD_BUFFER_SIZE 50
-#define PARTICLE_GROUP_BUFFER_SIZE 20
+#define FIELD_BUFFER_SIZE 200
+#define PARTICLE_GROUP_BUFFER_SIZE 50
 
 hid_t hdf5Type(enum DATA_TYPE type);
 size_t sizeOfType(enum DATA_TYPE type);