diff --git a/src/mathed/math_cursor.C b/src/mathed/math_cursor.C
index 58aa713375..b30a0f00d6 100644
--- a/src/mathed/math_cursor.C
+++ b/src/mathed/math_cursor.C
@@ -43,6 +43,7 @@
 using std::endl;
 using std::min;
 using std::max;
+using std::swap;
 using std::isalnum;