diff --git a/ai/default/default.c b/ai/default/default.c
index 8c4d2569e4..f10db36eff 100644
--- a/ai/default/default.c
+++ b/ai/default/default.c
@@ -22,6 +22,7 @@
 #include "../../airport.h"
 #include "../../depot.h"
 #include "../../variables.h"
+#include "../../bridge.h"
 #include "default.h"
 
 // remove some day perhaps?
diff --git a/ai/trolly/build.c b/ai/trolly/build.c
index 2d0b25ec54..550f17ceb0 100644
--- a/ai/trolly/build.c
+++ b/ai/trolly/build.c
@@ -12,6 +12,7 @@
 #include "../../engine.h"
 #include "../../station.h"
 #include "../../variables.h"
+#include "../../bridge.h"
 #include "../ai.h"
 
 // Build HQ
diff --git a/ai/trolly/pathfinder.c b/ai/trolly/pathfinder.c
index 25b3683ad0..3fc6cb1709 100644
--- a/ai/trolly/pathfinder.c
+++ b/ai/trolly/pathfinder.c
@@ -11,7 +11,7 @@
 #include "trolly.h"
 #include "../../depot.h"
 #include "../../tunnel_map.h"
-#include "../../variables.h"
+#include "../../bridge.h"
 #include "../ai.h"
 
 #define TEST_STATION_NO_DIR 0xFF
diff --git a/bridge.h b/bridge.h
index 18fcf81de8..d0aca75563 100644
--- a/bridge.h
+++ b/bridge.h
@@ -5,6 +5,10 @@
 #ifndef BRIDGE_H
 #define BRIDGE_H
 
+enum {
+	MAX_BRIDGES = 13
+};
+
 /** Struct containing information about a single bridge type
  */
 typedef struct Bridge {
diff --git a/town_cmd.c b/town_cmd.c
index 6ece0cc706..4cba570db0 100644
--- a/town_cmd.c
+++ b/town_cmd.c
@@ -24,6 +24,7 @@
 #include "gui.h"
 #include "unmovable_map.h"
 #include "variables.h"
+#include "bridge.h"
 
 enum {
 	/* Max towns: 64000 (8 * 8000) */
diff --git a/variables.h b/variables.h
index 47387ba5d6..665a452e59 100644
--- a/variables.h
+++ b/variables.h
@@ -414,9 +414,6 @@ extern const byte _airport_size_y[];
 VARDEF char _screenshot_name[128];
 VARDEF byte _vehicle_design_names;
 
-/* tunnelbridge */
-#define MAX_BRIDGES 13
-
 /* Forking stuff */
 VARDEF bool _dedicated_forks;