diff --git a/psycopg/cursor_type.c b/psycopg/cursor_type.c
index 8cc391bc..494c15de 100644
--- a/psycopg/cursor_type.c
+++ b/psycopg/cursor_type.c
@@ -497,7 +497,7 @@ psyco_curs_executemany(cursorObject *self, PyObject *args, PyObject *kwargs)
 {
     PyObject *operation = NULL, *vars = NULL;
     PyObject *v, *iter = NULL;
-    int rowcount = 0;
+    long rowcount = 0;
 
     static char *kwlist[] = {"query", "vars_list", NULL};
 
diff --git a/psycopg/pqpath.c b/psycopg/pqpath.c
index 3cd62e8d..58cd8c58 100644
--- a/psycopg/pqpath.c
+++ b/psycopg/pqpath.c
@@ -1241,7 +1241,7 @@ _read_rowcount(cursorObject *curs)
     if (!rowcount || !rowcount[0]) {
         curs->rowcount = -1;
     } else {
-        curs->rowcount = atoi(rowcount);
+        curs->rowcount = atol(rowcount);
     }
 }