diff --git a/src/newgrf.cpp b/src/newgrf.cpp
--- a/src/newgrf.cpp
+++ b/src/newgrf.cpp
@@ -1618,9 +1618,15 @@ static ChangeInfoResult AircraftVehicleC
 				avi->max_speed = (buf->ReadByte() * 128) / 10;
 				break;
 
-			case 0x0D: // Acceleration
-				avi->acceleration = (buf->ReadByte() * 128) / 10;
-				break;
+			case 0x0D: { // Acceleration
+				uint acceleration = (buf->ReadByte() * 128) / 10;
+				if (acceleration > UINT8_MAX) {
+					grfmsg(1, "Acceleration property of aircraft %d is too big.", engine + i);
+					acceleration = UINT8_MAX;
+				}
+				avi->acceleration = acceleration;
+				break;
+			}
 
 			case PROP_AIRCRAFT_RUNNING_COST_FACTOR: // 0x0E Running cost factor
 				avi->running_cost = buf->ReadByte();