diff --git a/src/newgrf.cpp b/src/newgrf.cpp
index 24b0238b33..2f02b049b6 100644
--- a/src/newgrf.cpp
+++ b/src/newgrf.cpp
@@ -7915,6 +7915,7 @@ static void ResetCustomAirports()
 					}
 					free(as->table);
 					free(as->depot_table);
+					free(as->rotation);
 
 					free(as);
 				}