diff --git a/taichi/backends/codegen_opengl.cpp b/taichi/backends/codegen_opengl.cpp
index 36867d249ebf8d..03a9af7c93890e 100644
--- a/taichi/backends/codegen_opengl.cpp
+++ b/taichi/backends/codegen_opengl.cpp
@@ -194,7 +194,7 @@ class KernelGen : public IRVisitor
   {
     if (stmt->op_type != UnaryOpType::cast) {
       emit("const {} {} = {}({});", opengl_data_type_name(stmt->element_type()),
-           stmt->raw_name(), opengl_unary_op_type_symbol(stmt->op_type),
+           stmt->raw_name(), unary_op_type_name(stmt->op_type),
            stmt->operand->raw_name());
     } else {
       // cast
diff --git a/taichi/platform/opengl/opengl_data_types.h b/taichi/platform/opengl/opengl_data_types.h
index 769f249703f07e..8df36e4f0a736a 100644
--- a/taichi/platform/opengl/opengl_data_types.h
+++ b/taichi/platform/opengl/opengl_data_types.h
@@ -23,44 +23,6 @@ inline std::string opengl_data_type_name(DataType dt)
   return "";
 }
 
-inline std::string opengl_unary_op_type_symbol(UnaryOpType type)
-{
-  switch (type)
-  {
-  case UnaryOpType::neg:
-    return "-";
-  case UnaryOpType::sqrt:
-    return "sqrt";
-  case UnaryOpType::floor:
-    return "floor";
-  case UnaryOpType::ceil:
-    return "ceil";
-  case UnaryOpType::abs:
-    return "abs";
-  case UnaryOpType::sgn:
-    return "sign";
-  case UnaryOpType::sin:
-    return "sin";
-  case UnaryOpType::asin:
-    return "asin";
-  case UnaryOpType::cos:
-    return "cos";
-  case UnaryOpType::acos:
-    return "acos";
-  case UnaryOpType::tan:
-    return "tan";
-  case UnaryOpType::tanh:
-    return "tanh";
-  case UnaryOpType::exp:
-    return "exp";
-  case UnaryOpType::log:
-    return "log";
-  default:
-    TI_NOT_IMPLEMENTED;
-  }
-  return "";
-}
-
 inline bool is_opengl_binary_op_infix(BinaryOpType type)
 {
   return !((type == BinaryOpType::min) || (type == BinaryOpType::max) ||