diff --git a/PHI-CL/data/b/mig.lua b/PHI-CL/data/b/mig.lua
index df69866..ff05793 100644
--- a/PHI-CL/data/b/mig.lua
+++ b/PHI-CL/data/b/mig.lua
@@ -257,6 +257,7 @@ for i = 1, #vir_sig do
             type = 'virtual-signal',
             name = 'signal-' .. char .. j,
             icon = '__PHI-CL__/graphics/signal-' .. j .. '/signal_' .. char .. '.png',
+            icon_size = (j == 'B' and 32) or 64,
             subgroup = (i < 11 and 'virtual-signal-number-2') or 'virtual-signal-letter-2',
             order = ((i < 11 and 'b[numbers]-[') or 'c[letters]-[') .. j .. '-' .. char .. ']',
             localised_name = {'phi-cl.combine', {'virtual-signal-name.signal-' .. char}, j}