diff --git a/libraries/SITL/SIM_Plane.cpp b/libraries/SITL/SIM_Plane.cpp
index 0fd94418d5..c529f33814 100644
--- a/libraries/SITL/SIM_Plane.cpp
+++ b/libraries/SITL/SIM_Plane.cpp
@@ -195,7 +195,7 @@ Vector3f Plane::getTorque(float inputAileron, float inputElevator, float inputRu
 	}
 
 
-	// Add torque to to force misalignment with CG
+	// Add torque to force misalignment with CG
 	// r x F, where r is the distance from CoG to CoL
 	la +=  CGOffset.y * force.z - CGOffset.z * force.y;
 	ma += -CGOffset.x * force.z + CGOffset.z * force.x;
diff --git a/libraries/SITL/examples/JSON/MATLAB/tcp_udp_ip_2.0.6/pnet.c b/libraries/SITL/examples/JSON/MATLAB/tcp_udp_ip_2.0.6/pnet.c
index 4f5d0cf1c7..7c681ed7ea 100644
--- a/libraries/SITL/examples/JSON/MATLAB/tcp_udp_ip_2.0.6/pnet.c
+++ b/libraries/SITL/examples/JSON/MATLAB/tcp_udp_ip_2.0.6/pnet.c
@@ -1116,7 +1116,7 @@ void mexFunction(
         Print_Start_Message();
 
         mexAtExit(CleanUpMex);
-        /* Init all connecttions to to free */
+        /* Init all connecttions to free */
         for(con_index=0; con_index<MAX_CON; con_index++)
             init_con(-1,STATUS_FREE);
         con_index=0;