diff --git a/builtins.cpp b/builtins.cpp
index 527aad13..33788515 100644
--- a/builtins.cpp
+++ b/builtins.cpp
@@ -705,6 +705,9 @@ lSetInternalFunctions(llvm::Module *module) {
         "__cos_uniform_double",
         "__acos_uniform_double",
         "__sincos_uniform_double",
+        "__tan_uniform_double",
+        "__atan_uniform_double",
+        "__atan2_uniform_double",
         "__undef_uniform",
         "__undef_varying",
         "__vec4_add_float",