diff --git a/tests/tmath.nim b/tests/tmath.nim
index b2f803b..9f3df79 100644
--- a/tests/tmath.nim
+++ b/tests/tmath.nim
@@ -20,7 +20,7 @@ cPlugin:
   import strutils
 
   proc onSymbol*(sym: var Symbol) {.exportc, dynlib.} =
-    sym.name = sym.name.strip(chars={'_'})
+    sym.name = sym.name.strip(chars={'_'}).replace("__", "_")
 
 cImport cSearchPath("math.h")