diff --git a/bin/ai/compat_0.7.nut b/bin/ai/compat_0.7.nut
index a2c605ed21..44e6acff9d 100644
--- a/bin/ai/compat_0.7.nut
+++ b/bin/ai/compat_0.7.nut
@@ -7,7 +7,7 @@
  * See the GNU General Public License for more details. You should have received a copy of the GNU General Public License along with OpenTTD. If not, see <http://www.gnu.org/licenses/>.
  */
 
-AILog.Info("0.7 API compatability in effect:");
+AILog.Info("0.7 API compatibility in effect:");
 AILog.Info(" - AITown::GetLastMonthProduction's behaviour has slightly changed.");
 AILog.Info(" - AISubsidy::GetDestination returns STATION_INVALID for awarded subsidies.");
 AILog.Info(" - AISubsidy::GetSource returns STATION_INVALID for awarded subsidies.");
diff --git a/bin/ai/compat_1.0.nut b/bin/ai/compat_1.0.nut
index 9d226cf898..5e7dd441f6 100644
--- a/bin/ai/compat_1.0.nut
+++ b/bin/ai/compat_1.0.nut
@@ -7,7 +7,7 @@
  * See the GNU General Public License for more details. You should have received a copy of the GNU General Public License along with OpenTTD. If not, see <http://www.gnu.org/licenses/>.
  */
 
-AILog.Info("1.0 API compatability in effect.");
+AILog.Info("1.0 API compatibility in effect.");
 
 AIRoad._BuildRoadStation <- AIRoad.BuildRoadStation;
 AIRoad.BuildRoadStation <- function(tile, front, road_veh_type, station_id)
diff --git a/bin/ai/compat_1.1.nut b/bin/ai/compat_1.1.nut
index cb539a721f..32127b438a 100644
--- a/bin/ai/compat_1.1.nut
+++ b/bin/ai/compat_1.1.nut
@@ -7,7 +7,7 @@
  * See the GNU General Public License for more details. You should have received a copy of the GNU General Public License along with OpenTTD. If not, see <http://www.gnu.org/licenses/>.
  */
 
-AILog.Info("1.1 API compatability in effect.");
+AILog.Info("1.1 API compatibility in effect.");
 
 AICompany.GetCompanyValue <- function(company)
 {
diff --git a/bin/ai/compat_1.2.nut b/bin/ai/compat_1.2.nut
index f039c59d8c..0082415e49 100644
--- a/bin/ai/compat_1.2.nut
+++ b/bin/ai/compat_1.2.nut
@@ -7,4 +7,4 @@
  * See the GNU General Public License for more details. You should have received a copy of the GNU General Public License along with OpenTTD. If not, see <http://www.gnu.org/licenses/>.
  */
 
-AILog.Info("1.2 API compatability in effect.");
+AILog.Info("1.2 API compatibility in effect.");
diff --git a/bin/ai/compat_1.3.nut b/bin/ai/compat_1.3.nut
index c41e3dff8f..036f3b5c34 100644
--- a/bin/ai/compat_1.3.nut
+++ b/bin/ai/compat_1.3.nut
@@ -7,4 +7,4 @@
  * See the GNU General Public License for more details. You should have received a copy of the GNU General Public License along with OpenTTD. If not, see <http://www.gnu.org/licenses/>.
  */
 
-AILog.Info("1.3 API compatability in effect.");
+AILog.Info("1.3 API compatibility in effect.");
diff --git a/bin/ai/compat_1.4.nut b/bin/ai/compat_1.4.nut
index 06983f8673..cc22b6ece4 100644
--- a/bin/ai/compat_1.4.nut
+++ b/bin/ai/compat_1.4.nut
@@ -7,4 +7,4 @@
  * See the GNU General Public License for more details. You should have received a copy of the GNU General Public License along with OpenTTD. If not, see <http://www.gnu.org/licenses/>.
  */
 
-AILog.Info("1.4 API compatability in effect.");
+AILog.Info("1.4 API compatibility in effect.");
diff --git a/bin/game/compat_1.2.nut b/bin/game/compat_1.2.nut
index 6126809c8a..37ff5907df 100644
--- a/bin/game/compat_1.2.nut
+++ b/bin/game/compat_1.2.nut
@@ -7,7 +7,7 @@
  * See the GNU General Public License for more details. You should have received a copy of the GNU General Public License along with OpenTTD. If not, see <http://www.gnu.org/licenses/>.
  */
 
-GSLog.Info("1.2 API compatability in effect.");
+GSLog.Info("1.2 API compatibility in effect.");
 
 GSTown._SetGrowthRate <- GSTown.SetGrowthRate;
 GSTown.SetGrowthRate <- function(town_id, days_between_town_growth)
diff --git a/bin/game/compat_1.3.nut b/bin/game/compat_1.3.nut
index d58a34685d..4116addbbc 100644
--- a/bin/game/compat_1.3.nut
+++ b/bin/game/compat_1.3.nut
@@ -7,7 +7,7 @@
  * See the GNU General Public License for more details. You should have received a copy of the GNU General Public License along with OpenTTD. If not, see <http://www.gnu.org/licenses/>.
  */
 
-GSLog.Info("1.3 API compatability in effect.");
+GSLog.Info("1.3 API compatibility in effect.");
 
 GSTown._SetGrowthRate <- GSTown.SetGrowthRate;
 GSTown.SetGrowthRate <- function(town_id, days_between_town_growth)
diff --git a/bin/game/compat_1.4.nut b/bin/game/compat_1.4.nut
index b9c5e2013b..6ae5f5dc19 100644
--- a/bin/game/compat_1.4.nut
+++ b/bin/game/compat_1.4.nut
@@ -7,4 +7,4 @@
  * See the GNU General Public License for more details. You should have received a copy of the GNU General Public License along with OpenTTD. If not, see <http://www.gnu.org/licenses/>.
  */
 
-GSLog.Info("1.4 API compatability in effect.");
+GSLog.Info("1.4 API compatibility in effect.");