diff --git a/psycopg/cursor_type.c b/psycopg/cursor_type.c
index a7bd11b4..f2dd379a 100644
--- a/psycopg/cursor_type.c
+++ b/psycopg/cursor_type.c
@@ -318,7 +318,7 @@ _psyco_curs_merge_query_args(cursorObject *self,
 {
     PyObject *fquery;
 
-    /* if PyString_Format() return NULL an error occured: if the error is
+    /* if PyString_Format() return NULL an error occurred: if the error is
        a TypeError we need to check the exception.args[0] string for the
        values: