diff --git a/wasm/codegen/generators/constants.py b/wasm/codegen/generators/constants.py
index 64b030cf..acfcac22 100644
--- a/wasm/codegen/generators/constants.py
+++ b/wasm/codegen/generators/constants.py
@@ -23,14 +23,20 @@ PRIMITIVE_TYPES: Set[str] = {
     "double",
     "float",
     "int",
-    "mjtByte",
+    "int16_t",
+    "int32_t",
+    "int8_t",
     "mjtBool",
+    "mjtByte",
     "mjtMeshBuiltin",
     "mjtNum",
     "mjtObj",  # Adding this to the primitives because it is used as int,
     "mjtSize",
     "size_t",
+    "uint16_t",
+    "uint32_t",
     "uint64_t",
+    "uint8_t",
     "uintptr_t",
     "unsigned char",
     "unsigned int",