diff --git a/ChangeLog b/ChangeLog
index e5c8550f..e4e40170 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,5 +1,8 @@
 2010-10-08  Daniele Varrazzo  <daniele.varrazzo@gmail.com>
 
+	* psycopg/typecast_binary.c: use PQfreemem to free memory allocated by
+	the libpq. Bug reported by Anton Kovalev.
+
 	* dropped PSYCOPG_OWN_QUOTING.
 
 	* psycopg/connection_int.c: Fixed access to freed memory in
diff --git a/psycopg/typecast_binary.c b/psycopg/typecast_binary.c
index e2efe13f..6a707eae 100644
--- a/psycopg/typecast_binary.c
+++ b/psycopg/typecast_binary.c
@@ -41,7 +41,7 @@ chunk_dealloc(chunkObject *self)
         FORMAT_CODE_PY_SSIZE_T,
         self->base, self->len
       );
-    free(self->base);
+    PQfreemem(self->base);
     self->ob_type->tp_free((PyObject *) self);
 }
 
@@ -176,8 +176,8 @@ typecast_BINARY_cast(const char *s, Py_ssize_t l, PyObject *curs)
           Py_DECREF((PyObject *) chunk);
       }
       if (str != NULL) {
-          /* str's mem was allocated by PQunescapeBytea; must use free: */
-          free(str);
+          /* str's mem was allocated by PQunescapeBytea; must use PQfreemem: */
+          PQfreemem(str);
       }
       if (buffer != NULL) {
           /* We allocated buffer with PyMem_Malloc; must use PyMem_Free: */