diff --git a/src/glew/cleansymbols.nim b/src/glew/cleansymbols.nim
index 27b1e85..a973318 100644
--- a/src/glew/cleansymbols.nim
+++ b/src/glew/cleansymbols.nim
@@ -22,6 +22,8 @@ const underscoreReg = re"_(.)"
 
 # Symbol renaming examples
 proc onSymbol*(sym: var Symbol) {.exportc, dynlib.} =
+  if sym.name.startsWith("__"):
+    sym.name = sym.name[2..<sym.name.len]
   if sym.name.startsWith("GL_BYTE"):
     sym.name = "CGL_BYTE"
   if sym.name.startsWith("GL_SHORT"):
@@ -56,3 +58,6 @@ proc onSymbol*(sym: var Symbol) {.exportc, dynlib.} =
     sym.name = sym.name.replace(underscoreReg, camelCase)
     if sym.name == "type":
       sym.name = "kind"
+
+  if sym.name.startsWith("GetTransformFeedbacki_v"):
+    sym.name = sym.name & "u"
diff --git a/src/glew/glew.nim b/src/glew/glew.nim
index 3a02450..ca07dad 100644
--- a/src/glew/glew.nim
+++ b/src/glew/glew.nim
@@ -1,5 +1,5 @@
 import os, strutils, strformat
-import nimterop/[cimport, build]
+import nimterop/[cimport, build, globals]
 
 const
   ProjectCacheDir* = getProjectCacheDir("nimglew")