diff --git a/src/Modules/ModTools.lua b/src/Modules/ModTools.lua
index 5f763b3f65..834749797e 100644
--- a/src/Modules/ModTools.lua
+++ b/src/Modules/ModTools.lua
@@ -207,7 +207,7 @@ function modLib.formatMod(mod)
 end
 
 function modLib.formatSourceMod(mod)
-    return s_format("%s|%s|%s", mod.value, mod.source, modLib.formatModParams(mod))
+    return s_format("%s|%s|%s", modLib.formatValue(mod.value), mod.source, modLib.formatModParams(mod))
 end
 
 function modLib.setSource(mod, source)