diff --git a/src/Autopilot/xmlauto.cxx b/src/Autopilot/xmlauto.cxx
index 9c917720d..cf730d299 100644
--- a/src/Autopilot/xmlauto.cxx
+++ b/src/Autopilot/xmlauto.cxx
@@ -759,7 +759,7 @@ void FGXMLAutopilot::init() {
 
             if ( ! build() ) {
                 SG_LOG( SG_ALL, SG_ALERT,
-                        "Detected an internal inconsistancy in the autopilot");
+                        "Detected an internal inconsistency in the autopilot");
                 SG_LOG( SG_ALL, SG_ALERT,
                         " configuration.  See earlier errors for" );
                 SG_LOG( SG_ALL, SG_ALERT,
diff --git a/src/Systems/system_mgr.cxx b/src/Systems/system_mgr.cxx
index cc1844d1a..da2917dae 100644
--- a/src/Systems/system_mgr.cxx
+++ b/src/Systems/system_mgr.cxx
@@ -41,7 +41,7 @@ FGSystemMgr::FGSystemMgr ()
                 enabled = true;
             } else {
                 SG_LOG( SG_ALL, SG_ALERT,
-                        "Detected an internal inconsistancy in the systems");
+                        "Detected an internal inconsistency in the systems");
                 SG_LOG( SG_ALL, SG_ALERT,
                         " system specification file.  See earlier errors for" );
                 SG_LOG( SG_ALL, SG_ALERT,