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-rw-r--r--tunnelbridge_cmd.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/tunnelbridge_cmd.c b/tunnelbridge_cmd.c
index 02829af96..fe6dae18d 100644
--- a/tunnelbridge_cmd.c
+++ b/tunnelbridge_cmd.c
@@ -209,7 +209,7 @@ int32 CmdBuildBridge(int x, int y, uint32 flags, uint32 p1, uint32 p2)
bridge_type = GB(p2, 0, 8);
railtype = GB(p2, 8, 8);
- if (p1 > MapSize()) return CMD_ERROR;
+ if (p1 >= MapSize()) return CMD_ERROR;
// type of bridge
if (HASBIT(railtype, 7)) { // bit 15 of original p2 param