diff --git a/lbr/Protofusion.lbr b/lbr/Protofusion.lbr
--- a/lbr/Protofusion.lbr
+++ b/lbr/Protofusion.lbr
@@ -3847,7 +3847,7 @@ MOLEX SMD P/N: 43743-8101</description>
 </device>
 </devices>
 </deviceset>
-<deviceset name="LTC3531-3.3">
+<deviceset name="LTC3531-3.3" prefix="U">
 <gates>
 <gate name="G$1" symbol="LTC3531" x="0" y="0"/>
 </gates>
@@ -4101,7 +4101,7 @@ short conditions is included.</descripti
 </device>
 </devices>
 </deviceset>
-<deviceset name="WIREPAD">
+<deviceset name="WIREPAD" prefix="J">
 <gates>
 <gate name="G$1" symbol="WIREPAD" x="0" y="0"/>
 </gates>