diff --git a/src/main/java/dan200/computercraft/shared/peripheral/modem/wired/BlockCable.java b/src/main/java/dan200/computercraft/shared/peripheral/modem/wired/BlockCable.java
index 7b3d2b7cc..bf4deb175 100644
--- a/src/main/java/dan200/computercraft/shared/peripheral/modem/wired/BlockCable.java
+++ b/src/main/java/dan200/computercraft/shared/peripheral/modem/wired/BlockCable.java
@@ -210,7 +210,7 @@ public boolean isValidPosition( BlockState state, IWorldReader world, BlockPos p
 
         BlockPos offsetPos = pos.offset( facing );
         BlockState offsetState = world.getBlockState( offsetPos );
-        return Block.hasSolidSide( offsetState, world, offsetPos, facing.getOpposite() );
+        return hasSolidSide( offsetState, world, offsetPos, facing.getOpposite() );
     }
 
     @Nullable
diff --git a/src/main/java/dan200/computercraft/shared/peripheral/modem/wired/TileCable.java b/src/main/java/dan200/computercraft/shared/peripheral/modem/wired/TileCable.java
index 9d69e2c72..d635bda98 100644
--- a/src/main/java/dan200/computercraft/shared/peripheral/modem/wired/TileCable.java
+++ b/src/main/java/dan200/computercraft/shared/peripheral/modem/wired/TileCable.java
@@ -201,8 +201,7 @@ private Direction getDirection()
     public void onNeighbourChange( @Nonnull BlockPos neighbour )
     {
         Direction dir = getDirection();
-        if( neighbour.equals( getPos().offset( dir ) ) && hasModem()
-            && getBlockState().isValidPosition( world, pos ) )
+        if( neighbour.equals( getPos().offset( dir ) ) && hasModem() && !getBlockState().isValidPosition( getWorld(), getPos() ) )
         {
             if( hasCable() )
             {