diff --git a/megamek/src/megamek/common/FixedWingSupport.java b/megamek/src/megamek/common/FixedWingSupport.java
index fa01afb6c80..a4e878c9a6a 100644
--- a/megamek/src/megamek/common/FixedWingSupport.java
+++ b/megamek/src/megamek/common/FixedWingSupport.java
@@ -320,4 +320,10 @@ public long getEntityType() {
     public boolean isAerospaceSV() {
         return true;
     }
+
+    @Override
+    public void setOriginalWalkMP(int walkMP) {
+        super.setOriginalWalkMP(walkMP);
+        autoSetSI();
+    }
 }
diff --git a/megamek/src/megamek/common/loaders/BLKFixedWingSupportFile.java b/megamek/src/megamek/common/loaders/BLKFixedWingSupportFile.java
index f70f2afdf64..64313fb5a7e 100644
--- a/megamek/src/megamek/common/loaders/BLKFixedWingSupportFile.java
+++ b/megamek/src/megamek/common/loaders/BLKFixedWingSupportFile.java
@@ -143,7 +143,6 @@ public Entity getEntity() throws EntityLoadingException {
 
         a.autoSetInternal();
         a.recalculateTechAdvancement();
-        a.autoSetSI();
         // This is not working right for arrays for some reason
         a.autoSetThresh();